[Azoth] Moved GetExpectedPluginClasses from Core.

Thus avoiding early initialization.
[XSD] Don't update the values while initializing (1.5-2x speedup).
[XSD] BaseSettingsManager::EnterInitMode().
[XSD] Parse settings in init mode (100x parsing speedup).
[LMP] Fixed ArtistBrowser tab.

Don't refer to a non-existent property.