Detaching the global-quick-tap functionality from the quick-tap term.
This makes way for two improvements:
1. This functionality can be added to combos under a unified name
'global-quick-tap-ms'.
2. This allows users to set a lower term for the 'global-quick-tap'
(typically ~100ms), and a higher term for the regular
quick-tap (typically ~200ms)
This deprecates the global-quick-tap option, however if it is set, the
quick-tap-ms value will be copied to global-quick-tap-ms.
* Add optional `hold-trigger-key-positions` hold-tap configuration
* Leverage configuration for decision making around when to trigger
hold decision in hold-taps.
* Add docs for new configuration.
* Tests for the new config/decision logic.
Tap-and-hold a hold-tap to hold the tap behavior so it can repeat.
After a tap, if the same key is pressed within `quick_tap_ms`, the
tap behavior is always picked.
This is useful for things like `&ht LSHFT BACKSPACE` where holding
the backspace is required.
Implements #288.
