Another basic Entity moveAtAngle assert
Add the pending about the Entity\move solidType & sweep params
Added tests for Entity\toString

* Made a comment fo Entity\__tostring about the metamethod only working
  for Entity and not subclasses.
Added tests for Entity distanceFrom, distanceToPoint, & distanceToRect

* Fixed Entity\distanceFrom
* Made useHitbox param explicitly false
* Also added the implementation for LP.distance, distanceRects, &
  distanceRectPoint.