style fixes for audioplayer and audiorecorder classes * @audioplayer/__get_properties__.m, @audioplayer/audioplayer.m, @audioplayer/display.m, @audioplayer/get.m, @audioplayer/isplaying.m, @audioplayer/pause.m, @audioplayer/play.m, @audioplayer/playblocking.m, @audioplayer/resume.m, @audioplayer/set.m, @audioplayer/stop.m, @audioplayer/subsasgn.m, @audioplayer/subsref.m, @audiorecorder/__get_properties__.m, @audiorecorder/audiorecorder.m, @audiorecorder/display.m, @audiorecorder/get.m, @audiorecorder/getaudiodata.m, @audiorecorder/getplayer.m, @audiorecorder/isrecording.m, @audiorecorder/pause.m, @audiorecorder/play.m, @audiorecorder/record.m, @audiorecorder/recordblocking.m, @audiorecorder/resume.m, @audiorecorder/set.m, @audiorecorder/stop.m, @audiorecorder/subsasgn.m, @audiorecorder/subsref.m: Style fixes. Do more basic argument checking. Use consistent style for error messages.