Twisted Electrons MEGAfm firmware

Big Thanks to Sebastian https://github.com/sebastianmika New Features NRPN parameter control (src/nrpn.cpp, include/nrpn.h): Full 14-bit NRPN send/receive for all synth parameters, including per-operator FM params, LFO shape/retrig/looping/link, arp mode/sequence steps, voice mode, setup settings (thru, pickup, MPE, stereo ch3, fat mode, brightness, etc.), and octave offset. SysEx preset/settings dump (src/sysex.cpp, include/sysex.h): Receive and apply incoming SysEx preset and arp sequence data. Setter functions (src/setters.cpp, include/setters.h): Extracted EEPROM-write logic for setup settings into reusable functions (e.g. setThru(), setFatMode(), setPickupMode()), shared between button/MIDI/NRPN code paths. Arp sequence modes S1/S2 distinguished in display (S1/S2 instead of SE for both). Auto-dump settings on random shuffle (reset-held sends SysEx dump of new state). Dockerfile for reproducible build environment with python2 + platformio. MIDI continue message now handled (triggers resync like start; e.g. Ableton does not send MIDI start, only continue) Behaviour Changes (deliberate) NRPN replaces CC for outgoing parameter changes: Pot/fader/button movements now send NRPN messages instead of raw CC, providing full 14-bit resolution and access to all parameters. Incoming CC still accepted for backwards compatibility. LFO & ARP clock rates unified and expanded from 11 to 13 steps: Added 1/4T (quarter note triplet) and 1/16T (sixteenth note triplet) divisions. Affects kArpRateDisplay, kMidiArpTicks, kLfoClockRates arrays in constants.h. LFO shape selection resets variant: Selecting square/saw for the first time always starts non-inverted. Selecting noise for the first time initializes with table length 2. Optionally the display is updated on fader/pot changes from MIDI NRPN (previously only showed values for local knob changes). Can be controlled via NRPN message and defaults to "off". [...]