Improve feature set storage method, fix board definitions and other bugs#6

Open

DeanBilotti wants to merge 8 commits intobackupbrain:masterfrom

DeanBilotti:master

Commits on Aug 27, 2016

__AVR_Atmega32U4__ -> __AVR_ATmega32U4__
jpoppe
authored

Commits on Jul 3, 2017

Use bitwise operators to store Arduino feature sets (fixes feature set bug where NUM_FEATURES set to 1 instead of 5)
DeanBilotti
committed
Use board model defines rather than hard coded literals.
DeanBilotti
committed

Commits on Jul 5, 2017

Merge remote-tracking branch 'jpoppe-patch/patch-1'
DeanBilotti
committed