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
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add support for engines with EntityView, EntityStruct and EntityViewStruct

introduced EntityViewStruct
cut a lot of code not needed anymore
breaking change engines add and remove callback now accept only ref params
breaking change QueryEntityViewsAsArray renamed in to QueryEntityViewsCacheFriendly

EnttiyStructs can now be built with an initializer

remove some redundant methods

- introduced the concept of global ID, as a combination of groupID and entityID
- only 256 groups and 2^24 entities can be created
- all the entities are now built always in group, when the group is not specified, the "standard" groups is used
- the groupID can be retrieved from the EGID
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add SimpleSubmissionEntityViewScheduler for testing purposes

fix QueryGroupedEntityViews