support.data_logger: add InfluxDB2DataLogger.

software: require libusb1 version with Windows binary wheels.

applet.sensor.scd30: add a note about the startup delay

applet.sensor.scd30: add a note about starting the sensor first

README: update acknowledgements.

cli: use correct module name in logger when running via `-m`.

applet.interface.uart: only shield from cancellation on socket side. Cancellation from the socket side means a client disconnected. Cancellation from the FIFO side means the applet is shutting down.

device.hardware: fix enumeration on Windows. While it would make sense for hotplugRegisterCallback() with flags set to HOTPLUG_ENUMERATE to call the function for each discovered device on Windows in spite of the lack of true hotplug, that was not a correct assumption.

firmware: remove LED abstraction. NFCI. This abstraction never worked well; the ACT LED manipulation was half inlined because function calls are tricky in interrupts, and the ICE LED manipulation was moved to the FPGA code in commit 23aacd73. Get rid of it, simplify the code, and make the firmware smaller. Also, rename LED constants to match the board silkscreen.

firmware: move ICE LED handling to FPGA code. NFCI. The existence of an FX2 pin dedicated to the ICE LED is an oversight; it should have been hooked up directly to CDONE to save a scarce FX2 pin. Handle the LED transparently in FPGA code, with the aim of eventually freeing its pin on a future revision. Also, eliminate redundant state in the form of ST_FPGA_RDY latched status bit.