revC1: update PCB from schematic (fix regulator values)

applet.audio.yamaha_opx: allow user-defined command stream filters. E.g. for glitching.

applet.audio.yamaha_opx: fix OPL3 reset.

README: update feature synopsys.

platform.ice40: fix commit dbf4de84.

platform.ice40: do not emit debug Verilog. This upstream change broke run-prebuilt and also made every bitstream ID request slower. It makes sense for a more traditional workflow, but not so much for Glasgow.

device.hardware: symbolize transfer errors.

cli: reraise applet errors after tearing down USB. This avoids spurious RuntimeError: Set changed size during iteration from USBHandle.close().

applet.interface.jtag_openocd: handle (ignore) quit command.

applet.interface.jtag_openocd: fix typo.