Updated AreaTrigger, fixed bug in Rect2F

Updated AreaTrigger, fixed bug in Rect2F

- AreaTrigger now works relative to its entity location.

- Resolved error in Rect2F's contains algorithm that went unnoticed for
way too long... This caused errors (noticably) in the AreaTrigger.

- Added example\test echo trigger to server.

Jeremy. Allen. Wildsmith