Merge pull request #71 from adafruit/pr-to-microsoft-2019-04-16

Many new boards and corrections; SAMD fuse repair

Use ARCADE-D5 as drive label

add arduino mkr1300 (#66)

Fix format of CF2 data

Speed up screen refresh

Account for CPU speed

Send out UF2 family in HF2_CMD_BININFO

Add screen support

Merge pull request #20 from ladyada/master

crickit & itsybitsy m4

Merge pull request #19 from ladyada/master

fix metro m4 URL & name