gplugin/gplugin

Setup meson devenv and port gplugin-gtk3-viewer to use the gplugin option group

2021-10-03, Gary Kramlich
197847a9814e
Setup meson devenv and port gplugin-gtk3-viewer to use the gplugin option group

Testing Done:
Ran the unit tests, and verified that `gplugin-query` and `gplugin-gtk3-viewer` show all of the test plugins.

Reviewed at https://reviews.imfreedom.org/r/988/
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>