Add rudimentary 'saveWorld' command in shared memory API and pybullet, see examples/pybullet/saveWorld.py

Use trilinear filtering instead of bilinear

examples/SharedMemory/SharedMemoryPublic.h

@@ -32,6 +32,7 @@ enum EnumSharedMemoryClientCommand
     CMD_CALCULATE_JACOBIAN,
     CMD_CREATE_JOINT,
     CMD_REQUEST_CONTACT_POINT_INFORMATION,
+	CMD_SAVE_WORLD,
     //don't go beyond this command!
     CMD_MAX_CLIENT_COMMANDS,
     
@@ -74,6 +75,10 @@ enum EnumSharedMemoryServerStatus
 		CMD_CONTACT_POINT_INFORMATION_FAILED,
 		CMD_CALCULATE_INVERSE_KINEMATICS_COMPLETED,
 		CMD_CALCULATE_INVERSE_KINEMATICS_FAILED,
+		CMD_SAVE_WORLD_COMPLETED,
+		CMD_SAVE_WORLD_FAILED,
+
+		//don't go beyond 'CMD_MAX_SERVER_COMMANDS!
         CMD_MAX_SERVER_COMMANDS
 };