gplugin/gplugin

Rename gplugin-gtk to gplugin-gtk3

2021-09-30, Gary Kramlich
130949050a8a
Rename gplugin-gtk to gplugin-gtk3

Testing Done:
Built and ran the unit tests and gplugin-gtk3-viewer on my dev machine.
Built the debian packages, installed them in a container and ran gplugin-gtk3-viewer via broadway.
Built the fedora packages, installed them in a container and ran gplugin-gtk3-viewer via broadway.

Bugs closed: GPLUGIN-98

Reviewed at https://reviews.imfreedom.org/r/961/
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>