applet.sensor.pmsx003: new applet.

applet.interface.analyzer: new applet.

access.simulation.demultiplexer: simulate (ignore) programmable pulls.

software: update libfx2 to latest release.

applet.memory.floppy: tune PLL parameters. Seems to result in much better data recovery (better than my USB floppy drive).

applet.memory.floppy: add --ignore-data-crc option. Useful for really bad floppies.

README: remove forum link.

platform.rev_c[01]: add pullups on IO pins.

README: add 1b2 Discord link.

applet.interface.uart: add --pulls option, for pull-up on RX. Useful if the buffer driving RX line is tristated, the DUT can be unpowered, certain multidrop scenarios, and so on.