This makes it more forgiving of constant acceleration mid-movement, if
the beginning of the movement looks random. Handy for mice that for some
reason generate bot-like constant velocities.
- Implement advanced LED flash support
- Tweak HAL_SPI_TransmitReceive to tolerate a longer SysTick interrupt
- Tune KEYBOARD_BOTDETECT parameters
- L-shift and R-shift are now high-speed alphanumeric keys