v1.2.0

v1.2.0 - more voices + improvements

• new feature: 8 voices! switch to them with E1
• new feature: "arp+latch only" mode doesn't play presses (for seamless arps)
• new feature: crow+jf support (untested)
• new feature: "legato" parameter can adjust how long notes are held in patterns/arps
• ux: while in menu, press note to switch menu to that voice
• ux: save latch steps when saving PSET
• fast json library added
• better grid64 support (better, but not great...still missing have the voices)