docktie_cli getx: improv to allow bulk/grouped extension to get

[casimpania]

Just like composer.lock where you have a lot of modules to install.

Add it to something like a [getx] section of env file, one line per extension till a whitespace is found.

This might help:

• https://stackoverflow.com/questions/14676714/grep-match-all-characters-up-to-not-including-first-blank-space
• https://stackoverflow.com/questions/7103531/how-to-get-the-part-of-a-file-after-the-first-line-that-matches-a-regular-expres

[casimpania]

Need to be implemented first to mitigate hassles by #25