Fix up ADC / polynomial regression bounds

Minor tweaks/refactoring

Merge pull request #1 from vomindoraan/develop

Use polynomial regression (degree 3) instead of LERP

WIP: Interpolate sync period values

Update sync period bounds, debug config

Merge branch 'sync' into develop

Update syncPeriod on every iteration, display BPM independently

Replace <USB-MIDI.h> with <MIDIUSB.h>

Set display brightness at startup, update speed less frequently

Add support for RGB LED (LED_COLOR)

SYNC_TIMEOUT: 5s → 1.5s

Add board comments to main .ino files

Start and stop sending MIDI Clock on Sync

Send MIDI Start/Stop/Continue messages alongside Clock