Board config for Teensy 2.0++, pins, timers, and PWM support (WIP).
Merge branch 'develop' into feature/port-teensy20pp
Copied AVR demo into demo for Teensy 2.0++.
Fixes for PWM for two AVR MCU types.  Probably broke others due to missing compiler directive checks.
Merge branch 'feature/port-teensy20pp' into feature/keyboard
Parenthesis bug fix.
Merge branch 'feature/port-teensy20pp' into feature/keyboard
Working on matrix and scanner.