Ensures that the -E or -F option, when used, is the first option
* i.e. grep -oE => grep -E -o
Updates _bash-it-grep to invoke grep with just the provided arguments
* This function was (and still is) unused, but decided this new functionality was actually more useful
Introduces _bash-it-fgrep to invoke grep -F
Removes type -P egrep from the _bash-it-*grep functions
For usages that were already going to be modified, use -F if appropriate
* Does not touch grep usages that may have benefited from -F, but were not otherwise considered for this PR
Adds shellcheck header to modified .bash files that didn't already have it
David Farrell