gplugin/gplugin

Bump the dev version to 0.36.0 as we changed API with GPluginManager being final

Also remove the doc comment for GPluginManagerClass which no longer exists.

Testing Done:
Compiled

Reviewed at https://reviews.imfreedom.org/r/1030/
<?xml version="1.0" encoding="UTF-8"?>
<gresources>
<gresource prefix="/org/imfreedom/keep/gplugin/gplugin/viewer/">
<file compressed="true">window.ui</file>
</gresource>
</gresources>