libgnt/libgnt

d72061c0dbf3
Setup the devenv and bump the meson requirement to 0.58.0

Testing Done:
changed some colorpairs in `build/config/gnt/gntrc` to verify that it was loading that file.

Reviewed at https://reviews.imfreedom.org/r/1571/
syntax: regexp
build.*\/
^subprojects\/.+\/