Misc warnings

- Removed/Commented some unused vars
- CValue::GetPropertyText() could return a temp reference to a variable on the stack, option wasnt used anywhere so removed.
- KX_ConstraintWrapper::GetConstraintId allows args but ignored them
- KX_ConstraintWrapper::PySetParam didnt return NULL on an error (messing up pythons exceptions).
- BLI_natstrcmp didnt return 0 when the while loop exited

source/gameengine/GamePlayer/common/GPC_RenderTools.cpp

@@ -288,10 +288,7 @@ void GPC_RenderTools::RenderText2D(RAS_TEXT_RENDER_MODE mode,
 										 int height)
 {
 	STR_String tmpstr(text);
-	int lines;
 	char* s = tmpstr.Ptr();
-	char* p;
-	
 
 	// Save and change OpenGL settings
 	int texture2D;