(for v0.4) Add a way to jump to bootloader and/or reset settings on startup #3213
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Moved the logic to select the type of reboot from behavior_reset.c to a new zmk_reset() function. This allows rebooting to bootloader from other code, and it gives us a starting point for future work to support other bootloaders aside from the Adafruit nrf52 bootloader.
For now, this just clears BLE bonds, but it can be updated in the future to handle clearing all settings.
This adds an optional feature to trigger an action if a specific key is held when the keyboard is powered on. It can be configured to jump to the bootloader and/or clear settings. This is inspired by QMK's "bootmagic lite" feature, and it is primarily intended as a way to recover a keyboard which doesn't have a physical reset button in case it is flashed with firmware that doesn't have a &bootloader key in its keymap. It can also be used to clear BLE bonds on the peripheral side of a split keyboard without needing to flash special firmware.
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I've built on #1757 to merge in the latest changes in ZMK. Most notably I've integrated the new boot retention mode settings and addressed the comments in the previous PR.
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