Glasgow Embedded / Glasgow - History

Compute bitstream ID and avoid rebuilding bitstreams if it matches.

Add `glasgow build` command to build applet bitstreams offline.

Update MPNs for out of stock capacitors and resistors.

Also fix a few MPNs that didn't quite match the manufacturer format,
and assign a MPN to J4.

Use Mfg/MPN fields in schematic instead of Mouser_PN.

There's no point in having Mouser_PN; pretty much every service,
including Mouser itself (!), works better (or even at all) with MPNs.

Allow flashing bitstream to ICE_MEM.

This also removes `glasgow test download` command in favor of
`glasgow run --bitstream`, allows using CLI arguments in applets when
building gateware, adds logging, and improves robustness of EEPROM
handling code overall.

Fixes #55.

Update libfx2 to use EEPROM page writes.

This also forces 400 kHz I2C mode to be used, and adds verification
for `glasgow flash`.

Flush GlasgowPort when it is garbage-collected.

Too easy to never call flush() explicitly and end up wondering why
nothing happens...