Plugins: Rename tk-plugin -> tk-inter to match tests
Plugins: Rename tk-plugin -> tk-inter to match tests

* Naming a plugin as plugin is not a good idea I think, unless it deals
  with plugins of the software, e.g. with PyQt ones.

kayhayen/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka