Keith McMillen Instruments QuNexus firmware

- Firmware updates now use a packetized, chunk-safe transfer with a per-packet identity handshake instead of sending the whole firmware image as one block. - Updated firmware to 2.2.1: adds a boot-time tare capture for key sensors to reduce stuck-key false triggers, and fixes a bug where a positive per-key sensitivity offset could permanently zero out pressure, bend, aftertouch, and CC output for that key. - Added Help menu item: "Open Log File Location" (debug console output is now also captured to a log file) ## Windows - Migrated to Windows MIDI Services (WMS), with automatic fallback to WinMM on machines without the WMS runtime installed. - Added Help menu item: "Install Windows MIDI Services". - The installer now detects an existing installation and offers to remove it before installing, instead of failing with no way forward. ### Bug Fixes - Fixed a firmware update occasionally being reported as failed even though it completed successfully. - Fixed the installer bundling a stale Visual C++ Redistributable that was never actually installed, which could crash the app on first launch on a clean machine. - Fixed the installer silently omitting most of its bundled content (manuals, DAW support scripts, SysEx presets, and the app icon).