Add support for nrf52833 (including bluetooth) and softdevice S113 7.2.0#599

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geeksville wants to merge 15 commits intoadafruit:masterfrom meshtastic:pr-nrf52833

+550,052-2,095

Commits on Jul 10, 2020

Add rak815 board
geeksville
committed

Commits on Jul 16, 2020

HardFault_Handler should be weakly bound, so apps can override as needed
geeksville
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Commits on Sep 7, 2020

Merge branch 'master' of https://github.com/meshtastic/Adafruit_nRF52_Arduino
geeksville
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Add a package.json file to fix platformio build (see below)
geeksville
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Merge remote-tracking branch 'root/master'
geeksville
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Commits on Oct 14, 2020

Commits on Oct 15, 2020

Commits on Oct 28, 2020

Add support for the 7.2.0 version of S113 soft device (details below)
geeksville
committed

Commits on Jan 16, 2021

fix heap corruption bug in ~String()
geeksville
committed