BGE PyAPI fixes

- CValue warning ShowDeprecationWarning("val = ob.attr", "val = ob['attr']"); had false positives because of python using getattr() internally. Only show the wanring now when a CValue is found.
- Py functions that accepted a vector and a GameObject were slowed down by PySequence_Check() first called on the GameObject, though this would fail it would try and get attributes from the game object - ending up in ~8 attribute lookups each time. Avoiding PySequence_Check() makes ob.getDistanceTo(otherOb) over twice as fast.

- Joystick hat events could crash the BGE for joysticks with more then 4 hats.
- PLY Import failed on PLY files from Carve, added some extra types.

release/scripts/ply_import.py

@@ -149,6 +149,7 @@ def read(filename):
 		      'uint8': 'B',
 		      'int16': 'h',
 		      'uint16': 'H',
+		      'ushort': 'H',
 		      'int': 'i',
 		      'int32': 'i',
 		      'uint': 'I',
@@ -156,6 +157,7 @@ def read(filename):
 		      'float': 'f',
 		      'float32': 'f',
 		      'float64': 'd',
+		      'double': 'd',
 		      'string': 's'}
 	obj_spec = object_spec()