- NVIC priorities are moved to separate file, all values are replaced wit symbolic names. Priorities should be the same.
- tiny change in DMA initialization
The timer was not being initialised correctly, it only worked by
accident due to timer configuration of other timer channels. This
explained why TIM3 didn't work in the mapping exclusion for the CC3D and
why for the LEDs to work correctly TIM2 had to be specified so that TIM3
was actually accidentally initialised still.
