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QMK Breaking Change - 2019 Aug 30

Four times a year QMK runs a process for merging Breaking Changes. A Breaking Change is any change which modifies how QMK behaves in a way that is incompatible or potentially dangerous. We limit these changes to 4 times per year so that users can have confidence that updating their QMK tree will not break their keymaps.

This document marks the inaugural Breaking Change merge. A list of changes follows.

Core code formatting with clang-format

All core files (drivers/, quantum/, tests/, and tmk_core/) have been formatted with clang-format
A travis process to reformat PR's on merge has been instituted
You can use the new CLI command qmk cformat to format before submitting your PR if you wish.

LUFA USB descriptor cleanup

Some code cleanups related to the USB HID descriptors on AVR keyboards, to make them easier to read and understand
More information: see https://github.com/qmk/qmk_firmware/pull/4871
No behaviour changes anticipated and no keymaps modified

Migrating `ACTION_LAYER_MOMENTARY()` entries in `fn_actions` to `MO()` keycodes

fn_actions is deprecated, and its functionality has been superseded by direct keycodes and process_record_user()
The end result of removing this obsolete feature should result in a decent reduction in firmware size and code complexity
All keymaps affected are recommended to switch away from fn_actions in favour of the custom keycode and macro features

Update Atreus to current code conventions

Duplicate include guards have bypassed the expected header processing behavior
All keymaps affected are recommended to remove duplication of <keyboard>/config.h to <keyboard>/keymaps/<user>/config.h and only provide overrides at the keymap level

Backport changes to keymap language files from ZSA fork

Fixes an issue in the keymap_br_abnt2.h file that includes the wrong source (keymap_common.h instead of keymap.h)
Updates the keymap_swedish.h file to be specific to swedish, and not just "nordic" in general.
Any keymaps using this will need to remove NO_* and replace it with SE_*.

Update repo to use LUFA as a git submodule

/lib/LUFA removed from the repo
LUFA set as a submodule, pointing to qmk/lufa
This should allow more flexibility with LUFA, and allow us to keep the sub-module up to date, a lot more easily. It was ~2 years out of date with no easy path to fix that. This prevents that from being an issue in the future

Migrating `ACTION_BACKLIGHT_*()` entries in `fn_actions` to `BL_` keycodes

fn_actions is deprecated, and its functionality has been superseded by direct keycodes and process_record_user()
All keymaps using these actions have had the relevant KC_FN* keys replaced with the equivalent BL_* keys
If you currently use KC_FN* you will need to replace fn_actions with the custom keycode and macro features

Remove `KC_DELT` alias in favor of `KC_DEL`

KC_DELT was a redundant, undocumented alias for KC_DELETE
It has been removed and all its uses replaced with the more common KC_DEL alias
Around 90 keymaps (mostly for ErgoDox boards) have been modified as a result

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