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Add symbols for Nordic nRF52833

Ryan Rotter requested to merge r12r/kicad-symbols:nrf52833 into master

Add symbols for Nordic nRF52833, both aQFN73 and QFN40 packages. Symbols are based off of the existing nRF52840 symbol (which uses the same aQFN73 package, and is very nearly but not quite pin compatible) and keep the same size layout for ease of porting schematics between parts/packages.

check_symbol.py still reports "Found non-numeric pin in a pinstack": this is an unavoidable consequence of the official naming of the pins in the datasheet as well as the in existing aQFN73 footprint. There are multiple VDD and VSS pins and this package uses letter+number combinations to name its pins.

Removed commas from all tags in the Nordic library to correct an error reported by check_symbol.py

nRF52833 Datasheet: https://infocenter.nordicsemi.com/pdf/nRF52833_PS_v1.5.pdf

Screenshot:

nrf52833.png

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