* [linuxinput] handle keys not known by libevdev Previously if libevdev could not resolve a numeric event code to a symbolic name the name "null" was used. This is useless for the user and may lead to duplicate-channel errors if multiple unknown keys are encountered. Instead use the numeric code itself as channel name if no symbolic code could be determined. Reported-in: https://community.openhab.org/t/linuxinput-binding-and-mouse-capture/122612/8 Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de> * [linuxinput] add channel description Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de>