colors.theme.bash: pre-compute colors

bash-it takes rather a while to startup, around 0.5 seconds on my
laptop. After a bit of timing it appears the majority of the time is
spent in themes/colors.theme.bash. The reason for that is the fancy
abstraction layers that use $(). For example, consider this code:

    red="$(color reset red)"

It will go through 9 forkexecs to evaluate:

    red="$(color reset red)"
        "$(__color_parse make_ansi reset red)"
        "$(__make_ansi reset red)"
        "\[\e[$(__reset red)m\]"
        "\[\e[0;$(__red)m\]"
        "\[\e[0;$(__color red)m\]"
        "\[\e[0;$(__color_normal_fg $(__color_red))m\]"
        "\[\e[0;$(__color_normal_fg 1)m\]"
        "\[\e[0;31m\]"

With all the variables in colors.theme.bash, this adds up to hundreds of
forks:

    $ strace -f bash ./colors.theme.bash 2>&1 | grep clone | wc -l
    649

The solution is to replace the function with its result:

    -red="$(color reset red)"
    +red='\[\e[0;31m\]'

This is safe, since colors.theme.bash never calls external functions or
takes any input. So, its result can be safely hard-coded.

This improves startup time dramatically. Try adding "time" to your .bashrc:

    # Load Bash It
    time source $BASH_IT/bash_it.sh

before:

    real    0m0.462s
    user    0m0.100s
    sys     0m0.399s

after:

    real    0m0.150s
    user    0m0.091s
    sys     0m0.064s

themes/colors.theme.bash

@@ -182,89 +182,89 @@ function echo_color {
 }
 
 
-black="$(color reset black)"
+black="\[\e[0;30m\]"
-red="$(color reset red)"
+red="\[\e[0;31m\]"
-green="$(color reset green)"
+green="\[\e[0;32m\]"
-yellow="$(color reset yellow)"
+yellow="\[\e[0;33m\]"
-blue="$(color reset blue)"
+blue="\[\e[0;34m\]"
-purple="$(color reset magenta)"
+purple="\[\e[0;35m\]"
-cyan="$(color reset cyan)"
+cyan="\[\e[0;36m\]"
-white="$(color reset white bold)"
+white="\[\e[0;37;1m\]"
-orange="$(color reset red fg bright)"
+orange="\[\e[0;91m\]"
 
-bold_black="$(color black bold)"
+bold_black="\[\e[30;1m\]"
-bold_red="$(color red bold)"
+bold_red="\[\e[31;1m\]"
-bold_green="$(color green bold)"
+bold_green="\[\e[32;1m\]"
-bold_yellow="$(color yellow bold)"
+bold_yellow="\[\e[33;1m\]"
-bold_blue="$(color blue bold)"
+bold_blue="\[\e[34;1m\]"
-bold_purple="$(color magenta bold)"
+bold_purple="\[\e[35;1m\]"
-bold_cyan="$(color cyan bold)"
+bold_cyan="\[\e[36;1m\]"
-bold_white="$(color white bold)"
+bold_white="\[\e[37;1m\]"
-bold_orange="$(color red fg bright bold)"
+bold_orange="\[\e[91;1m\]"
 
-underline_black="$(color black underline)"
+underline_black="\[\e[30;4m\]"
-underline_red="$(color red underline)"
+underline_red="\[\e[31;4m\]"
-underline_green="$(color green underline)"
+underline_green="\[\e[32;4m\]"
-underline_yellow="$(color yellow underline)"
+underline_yellow="\[\e[33;4m\]"
-underline_blue="$(color blue underline)"
+underline_blue="\[\e[34;4m\]"
-underline_purple="$(color magenta underline)"
+underline_purple="\[\e[35;4m\]"
-underline_cyan="$(color cyan underline)"
+underline_cyan="\[\e[36;4m\]"
-underline_white="$(color white underline)"
+underline_white="\[\e[37;4m\]"
-underline_orange="$(color red fg bright underline)"
+underline_orange="\[\e[91;4m\]"
 
-background_black="$(color black bg)"
+background_black="\[\e[40m\]"
-background_red="$(color red bg)"
+background_red="\[\e[41m\]"
-background_green="$(color green bg)"
+background_green="\[\e[42m\]"
-background_yellow="$(color yellow bg)"
+background_yellow="\[\e[43m\]"
-background_blue="$(color blue bg)"
+background_blue="\[\e[44m\]"
-background_purple="$(color magenta bg)"
+background_purple="\[\e[45m\]"
-background_cyan="$(color cyan bg)"
+background_cyan="\[\e[46m\]"
-background_white="$(color white bg bold)"
+background_white="\[\e[47;1m\]"
-background_orange="$(color red bg bright)"
+background_orange="\[\e[101m\]"
 
-normal="$(color reset)"
+normal="\[\e[0m\]"
-reset_color="$(__make_ansi '' 39)"
+reset_color="\[\e[39m\]"
 
 # These colors are meant to be used with `echo -e`
-echo_black="$(echo_color reset black)"
+echo_black="\033[0;30m"
-echo_red="$(echo_color reset red)"
+echo_red="\033[0;31m"
-echo_green="$(echo_color reset green)"
+echo_green="\033[0;32m"
-echo_yellow="$(echo_color reset yellow)"
+echo_yellow="\033[0;33m"
-echo_blue="$(echo_color reset blue)"
+echo_blue="\033[0;34m"
-echo_purple="$(echo_color reset magenta)"
+echo_purple="\033[0;35m"
-echo_cyan="$(echo_color reset cyan)"
+echo_cyan="\033[0;36m"
-echo_white="$(echo_color reset white bold)"
+echo_white="\033[0;37;1m"
-echo_orange="$(echo_color reset red fg bright)"
+echo_orange="\033[0;91m"
 
-echo_bold_black="$(echo_color black bold)"
+echo_bold_black="\033[30;1m"
-echo_bold_red="$(echo_color red bold)"
+echo_bold_red="\033[31;1m"
-echo_bold_green="$(echo_color green bold)"
+echo_bold_green="\033[32;1m"
-echo_bold_yellow="$(echo_color yellow bold)"
+echo_bold_yellow="\033[33;1m"
-echo_bold_blue="$(echo_color blue bold)"
+echo_bold_blue="\033[34;1m"
-echo_bold_purple="$(echo_color magenta bold)"
+echo_bold_purple="\033[35;1m"
-echo_bold_cyan="$(echo_color cyan bold)"
+echo_bold_cyan="\033[36;1m"
-echo_bold_white="$(echo_color white bold)"
+echo_bold_white="\033[37;1m"
-echo_bold_orange="$(echo_color red fg bright bold)"
+echo_bold_orange="\033[91;1m"
 
-echo_underline_black="$(echo_color black underline)"
+echo_underline_black="\033[30;4m"
-echo_underline_red="$(echo_color red underline)"
+echo_underline_red="\033[31;4m"
-echo_underline_green="$(echo_color green underline)"
+echo_underline_green="\033[32;4m"
-echo_underline_yellow="$(echo_color yellow underline)"
+echo_underline_yellow="\033[33;4m"
-echo_underline_blue="$(echo_color blue underline)"
+echo_underline_blue="\033[34;4m"
-echo_underline_purple="$(echo_color magenta underline)"
+echo_underline_purple="\033[35;4m"
-echo_underline_cyan="$(echo_color cyan underline)"
+echo_underline_cyan="\033[36;4m"
-echo_underline_white="$(echo_color white underline)"
+echo_underline_white="\033[37;4m"
-echo_underline_orange="$(echo_color red fg bright underline)"
+echo_underline_orange="\033[91;4m"
 
-echo_background_black="$(echo_color black bg)"
+echo_background_black="\033[40m"
-echo_background_red="$(echo_color red bg)"
+echo_background_red="\033[41m"
-echo_background_green="$(echo_color green bg)"
+echo_background_green="\033[42m"
-echo_background_yellow="$(echo_color yellow bg)"
+echo_background_yellow="\033[43m"
-echo_background_blue="$(echo_color blue bg)"
+echo_background_blue="\033[44m"
-echo_background_purple="$(echo_color magenta bg)"
+echo_background_purple="\033[45m"
-echo_background_cyan="$(echo_color cyan bg)"
+echo_background_cyan="\033[46m"
-echo_background_white="$(echo_color white bg bold)"
+echo_background_white="\033[47;1m"
-echo_background_orange="$(echo_color red bg bright)"
+echo_background_orange="\033[101m"
 
-echo_normal="$(echo_color reset)"
+echo_normal="\033[0m"
-echo_reset_color="$(__make_echo '' 39)"
+echo_reset_color="\033[39m"