Merge remote-tracking branch 'origin/master' into develop

[Keyboard] BDE Rev2 (#15877)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

Merge remote-tracking branch 'origin/master' into develop

More validation of declared LAYOUT macro names (#16520)

Change data driven "str" type to represent a quoted string literal (#16516)

* Change data driven "str" type to represent a quoted string literal

* Update docs

Remove `send_unicode_hex_string()` (#16518)

Merge remote-tracking branch 'origin/master' into develop

Bug report template: require `qmk doctor` output (#16517)

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analog.[ch]: remove unnecessary includes (#16471)

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Melody96 refactor (#16455)

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Update pr_checklist.md (#16484)

Update readme.md template link from https://github.com/qmk/qmk_firmware/blob/master/data/templates/avr/readme.md to https://github.com/qmk/qmk_firmware/blob/master/data/templates/keyboard/readme.md

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Typo in squeezing_avr.md (#16506)

Fixed typo in squeezing_avr docs.

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Fix use of ISSI driver config before init (#16493)

Merge remote-tracking branch 'origin/master' into develop

Fix helix/rev2 not working properly when using split_common. (#16512)

When helix/rev2 was using split_common, it didn't work properly and I couldn't type on the right hand side.

The cause is that the following code, added in 0.16.0 to `quantum/keyboard.c`, does not include `quantum/split_common/split_util.h` but instead includes `keyboards/helix/rev2/split_util.h`. Therefore, `split_pre_init()/split_post_init()` in `quantum/split_common/split_util.c` was not called.

```c
  #ifdef SPLIT_KEYBOARD
  #    include "split_util.h"
  #endif
```