Merge pull request #35 from b5i/master

remove .DS_Store and rename remaining_bytes value

rename absolute position packet

fix: add comments back

feat: add border to preview and fix a max size for it

feat: add loop support in waveforms for CDJ-3000

feat: add support for key and loop in cdj3000 status packets

feat: add support for absolute beat packets and fix UI bug problem when wheeling with the jog

fix parsing of cdj-3000 keepalive packets, drop NXS-GW packets

fixes for pyqt5 >= 5.10

gui: add menu button instead of browse/dload and add fader start/stop

pdblib: make color id Int8, as some dbs appear to have two Int8 fields

pdbprovider: improve error handling for partially broken dbs

pdbprovider: handle broken db sort column lookup

pdbprovider: don't retry database parsing after one failure