Add MPU-6000 register definitions.
Set up MPU-6000 SPI config for rocket.
Add mutex to F3D for compatibility.
`spi` -> `spid`, `i2c` -> `i2cd`.
Implement MPU-6000 driver.
Add sensor offsets to units.
Merge branch 'master' of github.com:osuroboticsclub/aerial_control
Add comments on SPI exchange setup/teardown.
Add aerial_v3 as new platform.
Convert hera to aerial_v3 for now.
Move heartbeat thread out of main.
Fix incorrect platform src spec in aerial_v3.
Fix aerial_v3 pwm init return type.
Disable SPI mutex lock for now.

Causes hang.
Add heartbeat thread to aerial_v3 platform.
Move ChibiOS HAL inits to platform inits.
Move platform HAL initialization to main platform init.
Reorder all instances of accel-gyro to gyro-accel.

Gyros are more important.
Make heartbeat LED pattern for aerial_v3 fancier.
Disable TIM1 and TIM3 for aerial_v3.