Add `hw_timer` driver and clarify use of Timer1/Timer2#1830

Merged

slaff merged 6 commits intoSmingHub:developfrom

mikee47:dev/timer-driver

Sep 11, 2019

Commits on Sep 5, 2019

Move `HardwareTimer.cpp` back into main Core (about to revise it)
mikee47
committed

Commits on Sep 10, 2019

Move HardwareTimer methods into header
mikee47
committed