applet.yamaha_opl: improve reset sequence to be completely robust.

applet.yamaha_opl: make looping almost completely seamless.

applet.yamaha_opl: support looped VGMs.

appplet.yamaha_opl: web: create buffers and sources via context. This should work better on Safari.

software: aiohttp is now a global dependency.

applet.yamaha_opl: add a web interface.

access.direct.demultiplexer: reset FIFOs when synchronizing.

applet.yamaha_opl: new applet.

applet.hd44780: require revC0+.

hardware: revB resistors did not really fix the FXMA brokenness :(