* Remove `/omit-if-no-ref/` from the behavior nodes.

* GATT characteristic allowing passng data + behavior
  label to invoke the behavior on the peripheral side.
* Behaviors have a locality setting to specify where they run.
* Build reset/power/RGB on peripheral.

This is a generalization of the existing concept of tri-layer support
that's already well known. Essentially, a conditional-layer
configuration activates a particular layer (the then-layer) when one or
more other layers (the if-layers) are activated.

This is commonly used on ortho keyboards to activate a third "adjust"
layer while the primary two layers ("lower" and "raise") are active.

Implements new hold/tap flavor, tap-unless-interrupted
Adds tests
Adds docs

* 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. 

* Basic driver, using the GD7965 driver as a basis, since the ICs
  are very similar.

Co-authored-by: Pete Johanson <peter@peterjohanson.com>

tapping_term_ms -> tapping-term-ms
quick_tap_ms -> quick-tap-ms

The old style works, although it's deprecated.

* Use lesser-known DT features to skip behaviors not referenced
  in the user keymap
* Update the behaviors to skip code if no nodes found.
* Remove some empty config/data structs where unused in
  behaviors.