Add Alchitry CuV2 boardHEADmain

Once flashed, the J11 LED alternate blinks with all the other LEDs. If
you hold the button, all LEDs blink in unison. The board definition is
otherwise incomplete.

The iceprog '-u' flag is available in my icestorm fork. This needs a
bunch of environment variables to build and run. Make sure you have all
the other Amaranth things installed.

Here's a very manual way to set the env vars, just in case you haven't
put anything on your path.

  YOSYS=yowasp-yosys \
    NEXTPNR_ICE40=yowasp-nextpnr-ice40 \
    ICEPACK=path/to/your/icepack \
    ICEPROG=path/to/your/iceprog \
    python3 -m amaranth_boards.alchitry_cuv2

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