Added a new setting to remember the user's preferred endpoint. When both USB and
BLE are connected, the preferred endpoint will be used.
Added a new behavior to control this setting. It supports commands:
&end END_USB - Prefer USB output
&end END_BLE - Prefer BLE output
&end END_TOG - Toggle between USB and BLE
Added zmk_ble_active_profile_is_connected() to allow code outside ble.c to check
the status of the active profile, and changed the ble_active_profile_changed
event to also notify when the active profile connects or disconnects.
Changed endpoint selection to to also update when the active profile changes,
connects, or disconnects.
This prevents stuck keys when switching endpoints by clearing
everything in the HID report and sending one last report before
switching to the new endpoint.
Added some utility functions and an event for tracking the state of the
USB connection.
Updated endpoints.c to select a single endpoint to send HID reports to
based on the status of the USB and BLE connections. Partially fixes#206.
Future commits will add a user setting to control which endpoint is used if
both USB and BLE are ready.
