- Added a test scene for LugusConfig and subclasses.
 - Added several test profile files in the Config folder.
 - The scene allows to load profiles from disk, to add additional profiles and save them to disk again.
 - Profiles can be altered by writing string values to the dictionary of the currently selected profile.

 - Resolved several bugfixes that prevented loading profiles from the Config folder.
 - LugusConfigDefault now correctly calls all Store-methods from its profiles to save them on disk.
 - Added a boolean _changed to LugusConfigProfileDefault that prevents unnecessary disk writes when the profile didn't change during program execution.
 - Added a Remove method to ILugusConfigProfile that allows to remove a certain <key, value>-pair from the profile.