gplugin/gplugin

Add scaffolding for GTK4 widgets

2021-10-04, Elliott Sales de Andrade
b4b2c4d16058
Add scaffolding for GTK4 widgets

This just compiles new things, with no real implementation right now. I'm just posting because rbt won't accept multi-commit reviews from me.

Testing Done:
Compile only, really.

Reviewed at https://reviews.imfreedom.org/r/991/
The following individuals have contributed to this project.
Ankit Vani <a@nevitus.org>
EionRobb <eion@robbmob.com>
Elliott Sales de Andrade <quantum.analyst@gmail.com>
Gary Kramlich <grim@reaperworld.com>
ivanhoe <ivanhoe@fiscari.de>
Jason Scherer <schereja@gmail.com>
John Bailey <rekkanoryo@rekkanoryo.org>
Mike Ruprecht <cmaiku@gmail.com>
Olaf Hering <olaf@aepfle.de>
Richard Laager <rlaager@pidgin.im>
Sorvival <sorvival@tutanota.com>