gplugin/gplugin

dbb7c8af6b9b
Use namespaces for all of the vala and genie plugins.

This was discovered when I loaded the vala and native test plugins at the same
time in gplugin query and they both tried to register types with the same
names.

Testing Done:
Ran unit tests and `gplugin-query` with all of the loaders and test plugins queryable.

Reviewed at https://reviews.imfreedom.org/r/984/
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>