refactor: Implement Compose without global state

Thanks to the previous commit, a modifier key can now be more complex
than just a KeyValue.Modifier. This allows a more elegant implementation
of the compose key, that could be taken as a base for other features
(eg. unicode hex entry, hangul)

The COMPOSE_PENDING modifier is removed as keys of kind Compose_pending
can act as a modifier. This has the advantage of highlighting the key
that was last pressed in the sequence.

Rules are added to Pointers: Non-special but latchable keys must clear
latches and cannot be locked with a long press. These rules were not
needed before but were intended.

0 files changed, 0 insertions, 0 deletions