implemented I2C arbiter for pin enabling/disabling during I2C port sharing
configured pins PTB0/1 for I2C
moved inertial to imu for upcoming drivers
first contact to MPU6050
fixed typo
using I2C arbiter in main
minor tweaks on the I2C arbiter usage
Merge branch 'feature/mpu6050'

Conflicts:
	frdm-kl25z-acc-uart/Sources/main.c