Glasgow Embedded / Glasgow - History

applet.memory.prom: new applet, replacing memory.27x.

The applet has been completely rewritten with a nicer implementation,
dramatically improved performance, and support for indirectly
addressing memories with many address lines through a shift register.

access.direct.arguments: add support for empty pin sets.

software: add `toolchain` extra for turnkey YoWASP installation.

applet.memory.27x: increase default read latency to 500 ns.

It seems like for some really old EPROMs, like NEC D2732D, 250 ns is
not quite enough, and 500 ns would be safer.

software: include FX2 firmware in the repository.

This has several significant benefits:
* End users no longer have to install sdcc, which can be difficult
on Windows, and still adds complexity elsewhere.
* Updating a source checkout is simplified, and firmware/software
mismatch is no longer possible.
* setup.py is simplified, and the odd breakage we had in the past
is no longer possible. It will also be easier to convert it to
the declarative format in the future.