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.

applet.memory.27x: new applet.

cli: fix intermittent analyzer error. Due to a logic error, sometimes analyzer would crash with a message similar to: vcd.writer.VCDPhaseError: Out of order timestamp: 171587604

examples: update boilerplate for nMigen.

applet.sensor.pmsx003: add documentation references.

applet.sensor.pmsx003: unmark as preview. Also, verified that it works fine with PMS7003.

CI: use YoWASP instead of custom Yosys/nextpnr build scripts.

applet.interface.analyzer: fix crash on ^C if no data was written.

applet.interface.analyzer: add --pull-ups and --pull-downs options.

support.data_logger: fix edge cases in influxdb argument parsing.