Extend xexun protocol - kn and kmh
Extend xexun protocol - kn and kmh

Updated xexun protocol to be able to use kmh as source speed.
jon-stumpf/traccar,orcoliver/traccar,ninioe/traccar,jon-stumpf/traccar,tsmgeek/traccar,jssenyange/traccar,5of9/traccar,tananaev/traccar,jssenyange/traccar,tsmgeek/traccar,jssenyange/traccar,orcoliver/traccar,ninioe/traccar,tsmgeek/traccar,ninioe/traccar,5of9/traccar,AnshulJain1985/Roadcast-Tracker,orcoliver/traccar,tananaev/traccar,tananaev/traccar,jon-stumpf/traccar,AnshulJain1985/Roadcast-Tracker