* usermods only need to to `if (!pinManager.joinWire()) return;`
* joinWire will
* * check if global I2C are defined - return false if not defined
* * aloocate HW_I2C pins - return false on error
* * call Wire.begin() if needed.
Improve co-existence of several popular usermods with respect to shared I2C bus.
- ensure that i2c_sda and i2c_scl are used when defined
- ensure that HW_PIN_SDA / HW_PIN_SCL are not overwritten
- ensure that Wire.begin()nis always called with user-defined pins (remove rogue Wire.begin() without parameters)
- ensure that set.cpp / cfg.cpp use esp32-specific global Wire objects.
4LD: fixing wrong type for PINs
mpu6050:
- fix "hidden" use of GPIO 15
- restore DEBUG macros (overwritten by I2CDev lib)
- fix not initialized memory problem
- added a few USER_PRINT messages
- 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
