* Make it easier to use *just* event payloads by defining the data,
and then having event manager macros generate "wrapper structs"
* Improve is_*/cast_* APIs to hide details of full event struct.
* Create `zmk_event_t` typedef to pass to event handlers.
* Bring event names inline w/ consistent `zmk_` prefix.
* Add uppermost, current layer status widget to oled
* Run clang format
* Fixup display widget source includes in CMakeLists
* Update layer widget to only be enabled on primary half of a split keyboard and shuffle some of the options specific to the widget to be enabled via the widget
* Update to latest lvgl/zmk/zephyr ; remove version text from oled per PR
* Fixup file names
* Remove last remenants of the version display text from the oled
* Fixup clang-format
Co-authored-by: KemoNine <mcrosson@kemonine.info>
Pete Johanson