Continued example boards

[ducky64]

More example boards:

• IoT soldering iron controller with discrete synchronous buck converter
• Update the IoT fan controller with a discrete micro (instead of RF module)
• Picoprobe, maybe this will be the RP2040 board that finally works
• USB key, as an example of an ultra-size-optimized board
• Jacdac mechanical keyswitch

Including these additional libraries:

• CombinedCapacitor as a multipack device, to combine capacitors on the same net
• Half-bridge with gate driver, replacing the old half-bridge generator which didn't work
• HDC1080 I2C temperature sensor
• UCC27282 gate driver, 5v compatible with shoot through protect
• JLC caps: allow bypassing capacitance-based minimum package size
• JLC crystals: add 2520 sized crystal
• JLC switch FET: add manual gate charge
• 0404 RGB LED
• LP5907: X2SON version
• L78Lxx high(er) votlage regulator
• ESP32C3 (raw chip) microcontroller, plus support for opt-in use of strapping pins
• ESP32S3: opt-in for GPIO0 strapping pin
• Refactor IoController _make_export_vector for better composability, to support remapping strapping pins in the wrapper block
• STM32G031 and STM32L432 (crystal-less USB!) microcontrollers
• OPA2333 dual (multipacked) precision opamp
• MAX98357A in QFN
• USB-A plug pads (PCB as the plug)

and these infrastructural abstract components / changes:

• abstract antenna
• voltage-source/sink wrapper around inductor for power filtering
• packed opamp element
• TVS diode, including wrappers across power and digital lines
• better definition for gate drivers
• low-pass RC for analog signals
• Pi impedance match filter with unit tests
• Jacdac port and links infrastructure
• simplify some part table parsing regex

and these bugfixes:

• support absolute tolerances (+/-pF) in capacitor table parser
• support optional reset on micros with internal pull resistors, don't require reset on SWD header (but connected by default)
• plumb through input and output voltage ripple specs for switching converters
• support optional reference for diffamp (gnd by default)
• make matching_parts post-sort