io_import_lipSync_Importer: adress the Prop error on reload

Bumped version to 0.5.2
Part of the T51547:
Move the registration of scene properties outside the Panel
as storing them there would make all sorts of nice things
after a reload
UI properties are moved to an already existing regMenuTypes
PropertyGroup

Pep8 cleanup
Replace bpy.props star import with a tuple one
The refactor is only related to address the register/reload
as the logic of the import is left untouched
Should be no functional changes on the user's side
nor other bugs / issues are fixed