Make .bullet serialization mode robust:

Deal with broken DNA serialization. Bullet 2.76 release revision 2035 - 2046 was broken, and this includes the Maya Dynamica plugin.
Added some workaround to deal with the broken .bullet files, instead of crashing.

Extras/Serialize/BulletFileLoader/bFile.h

@@ -32,7 +32,8 @@ namespace bParse {
 		FD_FILE_64   =8,
 		FD_BITS_VARIES    =16,
 		FD_VERSION_VARIES = 32,
-		FD_DOUBLE_PRECISION =64
+		FD_DOUBLE_PRECISION =64,
+		FD_BROKEN_DNA = 128
 	};
 
 
@@ -71,7 +72,7 @@ namespace bParse {
 
 			// buffer offset util
 		int getNextBlock(bChunkInd *dataChunk,  const char *dataPtr, const int flags);
-		void safeSwapPtr(char *dst, char *src);
+		void safeSwapPtr(char *dst, const char *src);
 
 		virtual	void parseHeader();