Updated existing pre-commit hooks and added some new hooks:
- Remove trailing whitespace
- Ensure every non-empty file ends with a new line
- Check YAML file validity
- Prevent adding large files
- Ensure any scripts with shebangs are executable
Added a GitHub action to run pre-commit on every commit. Removed any
existing actions which duplicate pre-commit.
Ran pre-commit on the codebase.
Added ZMK_MACRO_DEFAULT_WAIT_MS and ZMK_MACRO_DEFAULT_TAP_MS to set
global defaults for the wait-ms and tap-ms properties of macros.
Also reduced the default timings for macros, since it's been reported
many times that 100 ms is too slow.