Define a new message, B_KEY_MAP_LOADED, that is broadcast to applications by
the Input Server each time a key map is loaded. This allows apps that cache
key-map data to know when their copy has become stale.
Change InputServer::HandleGetSetKeyMap() so it returns an error in the event
loading even the system (fallback) key map fails.
Change-Id: Icc6c884f695ca59c687d83c680bb2fb467dd90cc
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1741
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
b9d9c282fd