DispatchOnChange and DispatchOnSet must receive an EGID (sorry)
Rename GenericEntityDescriptorHolder to UnityEntityDescriptorHolder

Exclusive groups can allocate a specific range now

fix MoveEntityView function
fix Preallocate function

- reworked IEntityViewsDB interface, some breaking renaming and added more functions
- added two struct friendly functions as workaround while we wait for the c# byref keyworkd: QueryEntities<T> and ExecutOnEntity<T>
- fix the SwapEntityGroup function
- various optimizations
- implement a simple and efficient way to initialize entity struct values (EntityStructInitializer)
- check (in debug only) if entitystruct has only value and primitive types, otherwise throw exception
-