IMO support in usermod games, add 3D IMO cube effect

- platformio: add USERMOD_MPU6050_IMU and ElectronicCats/MPU6050 @ 0.6.0 to esp32mdevums
- USERMOD_MPU6050_IMU: update readme.md and usermod_mpu650_imu.h
- usermod_v2_games: support for  USERMOD_MPU6050_IMU, add mode_IMUTest and class Frame3D and mode_3DIMUCube, remove old gyro handling
- usermods_list.cpp: add USERMOD_MPU6050_IMU

wled00/usermods_list.cpp

@@ -136,6 +136,9 @@
 #include "../usermods/audioreactive/audio_reactive.h"
 #endif
 
+#ifdef USERMOD_MPU6050_IMU
+#include "../usermods/mpu6050_imu/usermod_mpu6050_imu.h"
+#endif
 #ifdef USERMOD_GAMES
 #include "../usermods/usermod_v2_games/usermod_v2_games.h"
 #endif
@@ -263,6 +266,11 @@ void registerUsermods()
   #ifdef USERMOD_AUDIOREACTIVE
   usermods.add(new AudioReactive());
   #endif
+
+  #ifdef USERMOD_MPU6050_IMU
+  usermods.add(new MPU6050Driver());
+  #endif
+
   #ifdef USERMOD_GAMES
   usermods.add(new GamesUsermod());
   #endif