create a C/C++ plugin system for pybullet / C-API.

examples/SharedMemory/SharedMemoryPublic.h

@@ -72,6 +72,7 @@ enum EnumSharedMemoryClientCommand
 	CMD_REQUEST_MOUSE_EVENTS_DATA,
 	CMD_CHANGE_TEXTURE,
 	CMD_SET_ADDITIONAL_SEARCH_PATH,
+	CMD_CUSTOM_COMMAND,
     //don't go beyond this command!
     CMD_MAX_CLIENT_COMMANDS,
     
@@ -167,6 +168,9 @@ enum EnumSharedMemoryServerStatus
 		CMD_REQUEST_COLLISION_INFO_FAILED,
 		CMD_REQUEST_MOUSE_EVENTS_DATA_COMPLETED,
 		CMD_CHANGE_TEXTURE_COMMAND_FAILED,
+		CMD_CUSTOM_COMMAND_COMPLETED,
+		CMD_CUSTOM_COMMAND_FAILED,
+
         //don't go beyond 'CMD_MAX_SERVER_COMMANDS!
         CMD_MAX_SERVER_COMMANDS
 };