gplugin/gplugin

Update register/unregister_loader to return a boolean with an error. Fixes GPLUGIN-35
feature/loader-registration-cleanup
2020-02-23, Gary Kramlich
d3a78065c3fa
Update register/unregister_loader to return a boolean with an error. Fixes GPLUGIN-35
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>
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>