MIDI Drum Visualization and Windows Build Fix

[cwitkowitz]

Summary:

• Implements drum-aware MIDI visualization
• Adds drum-note flag to MIDI notes
• Identifies channel 10 MIDI notes as drums
• Renders drum notes as X markers in the piano roll

Additional Fix:

• Fixes Windows runtime DLL path detection for Visual Studio BuildTools installs

Context:

• While implementing Drum MIDI Visualization on Windows, I encountered a runtime DLL path issue that prevented the application from running correctly
• This fix was made in order to proceed with development and was included as an addition

Notes:

• Drum changes are visualization only
• No synthesis/audio behavior was modified (we agreed that this was already sufficiently handled by https://huggingface.co/spaces/teamup-tech/midi-synthesizer)
• For Windows DLL path fix; will open a follow-up ticket to make VS detection more robust

[cwitkowitz]

Note that the build fix for Windows in this PR is not a general solution. A general solution has been attempted in the branches potential-windows11-build-fix and simplified-windows11-build-fix.