The HID ids (accessory ids or UHID ids) were defined by the keyboard and
mouse implementations.
Instead, define them in the common HID part, and make that id part of
the sc_hid_event.
This prepares the introduction of gamepad support, which will handle
several gamepads (and ids) in the common HID gamepad code.
PR #5270 <https://github.com/Genymobile/scrcpy/pull/5270>
An event contained several fields:
- the accessory id
- the HID event data
- a field ack_to_wait specific to the AOA implementation.
Extract the HID event part to prepare the factorization of HID event
creation.
PR #4473 <https://github.com/Genymobile/scrcpy/pull/4473>
