This brings the 'global-quick-tap' functionality to combos by filtering
out candidate combos that fell within their own quick tap term.
I also replaced `return 0` with `return ZMK_EV_EVENT_BUBBLE` where appropriate.
(I assume this was done in past as it is similar to errno returning, but
being that this is to signify an event type I find this more clear)
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.
