Generalize SWD debugging stuff so it works on all nrf52 targets. #4377
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Move the SWD debugging support I added to rak4631 up into the shared nrf52 platform.ini file - this allows SWD debugging on all of our targets. I defaulted to using "stlink" USB debugging dongles instead of "jlink" because stlinks are much cheaper and just as fast. This shouldn't change behavior for anyone who was already doing debugging because most of the nrf52 projects have been manually slamming in jlink instead.
Add a small script in bin for installing bootloaders on wio tracker boards (per @markbirss wisdom) mostly as documentation for other advanced developers.