klomp-lib: add getProperty() sub
klomp-cmd: pull renice to a library property instead of hardcoding on hostname
klomp-cmd: add renice message
klomp-cmd: replace hardcoded cmd 'lpsmagic -once' with lib properties startCmd and playlistCmd
klomp-cmd: replace hardcoded 'killall mplayer' with lib prop stopCmd
klomp-cmd: replace hardcoded 'su user' with lib prop targetUser
klomp-cmd: replace hardcoded pause()=>stop() with lib prop disallowPause
klomp-cmd: remove unused hardcoded hostname checks