Glasgow Embedded / Glasgow - History

applet.memory.onfi: convert to native amaranth

Addresses `memory.onfi` item from #150.

applet.video.rgb_input: convert to native amaranth

Addresses the `video.rgb_input` item from #150.

CI: add pypy-{3.8,3.9} and 3.11 (with failure allowed) to build matrix.

applet.memory.floppy: convert to native amaranth

Addresses `memory.floppy` item from #150.

Update gitignore

Add the venv directory to the ignore set so that python environments
won't show up as uncommitted files.