BGE Clean-up: New EXP prefix for the BGE Expression module

The expression module now uses an EXP prefix and it follows a
distribution similar to blender.

Additionally the hash function in EXP_HashedPtr.h was simplified and the
files EXP_C-Api.h &.EXP_C-Api.cpp were deleted because were unused.

Reviewers: campbellbarton, moguri, sybren, hg1

Projects: #game_engine

Differential Revision: https://developer.blender.org/D1221

source/gameengine/VideoTexture/ImageBase.cpp

@@ -37,7 +37,7 @@ extern "C" {
 #include <vector>
 #include <string.h>
 
-#include "PyObjectPlus.h"
+#include "EXP_PyObjectPlus.h"
 #include <structmember.h>
 
 #include "FilterBase.h"