Feature/64 add conditional showhide of inspector properties

[JaXt0r]

I rearranged the lables and groupings of GameConfiguration.

I also added a community package which provided features like Separator, Groups, and LabelOverrides. https://github.com/Deadcows/MyBox
It has 1.9k GitHub stars and is recommended within Unity Forums multiple times. It mostly contains Editor code #ifdef UNITY_EDITOR and therefore won't affect our production builds.

To Test:

• Please review the changes and suggest alternatives if you want to rename/reorder some fields.
• Check briefly if the game loads (But I didn't alter the actual asset-GUID. Therefore it should work as before)
• Also some fields will display only if conditions are met. These are:
  • LoadFromSaveSlot & SaveSlotToLoad -> Dependent on EnableMainMenu
  • *MeshCullingGroup & ShowVOBMeshCullingGizmos -> Dependent on EnableVOBMeshCulling
  • EnableNPCRoutines & SpawnNPCInstances -> Dependent on SpawnNPCs

Hint: With the default value changes, I changed the default Controls from XRIT to HVR. I added a troubleshooting note inside Developer documentation as well: https://github.com/Gothic-UnZENity-Project/Gothic-UnZENity/wiki/Developer's-Guide

[JaXt0r]

@lmichaelis feel free to check as well before we merge. No rush.

[lmichaelis]

Why are we using regions again? Style Guide specifically says not to. Otherweise looks nice :)

[JaXt0r]

Right 😅. The GameConfiguration is quite big, but I don't want to split it into multiple files these days. The regions follow the same logic as the Foldable elements in the UI. Better readability. But I can change this to a 3-line comment if needed.