Firmware 3.9

Changed all modules that take triggers or gates to have schmitt triggers on inputs and generally improve trigger / gate handling

Improve eurorack style clock support

Fix highlight bug with lists

Better labels for in and out

QR codes for manuals and videos in more for modules.

Improve disconnect screen

Add flip screen mode for mounting Hector upside down

Fix issue with euclidean triggers being too short. All triggers now at least 1 ms.