makes bullet independant from gameengine for cmake, introduces esc-key during sim, disables collisions when no bullet there

tools/Blender.py

@@ -392,6 +392,8 @@ class BlenderEnvironment(SConsEnvironment):
             lenv.Append(CPPDEFINES=defines)
             if lenv['WITH_BF_GAMEENGINE']:
                     lenv.Append(CPPDEFINES=['GAMEBLENDER=1'])
+            if lenv['WITH_BF_BULLET']:
+                    lenv.Append(CPPDEFINES=['WITH_BULLET=1'])
             # debug or not
             # CXXFLAGS defaults to CCFLAGS, therefore
             #  we Replace() rather than Append() to CXXFLAGS the first time