Fix pybullet Windows build errors: C99 requires variables to be defined at the start of the function.

Improve CMake Windows support to build PyBullet (BUILD_PYBULLET)
Implement b3LoadSdfCommandInit in shared memory API
Implement pybullet SDF loading binding, in loadSDF API
TODO for SDF support is provide way to query object/link/joint information.

examples/SharedMemory/PhysicsServerCommandProcessor.h

@@ -19,6 +19,10 @@ class PhysicsServerCommandProcessor
 protected:
 
 
+    
+
+    bool loadSdf(const char* fileName, char* bufferServerToClient, int bufferSizeInBytes);
+
 	bool loadUrdf(const char* fileName, const class btVector3& pos, const class btQuaternion& orn,
                              bool useMultiBody, bool useFixedBase, int* bodyUniqueIdPtr, char* bufferServerToClient, int bufferSizeInBytes);