<DE2> Fix some minor problems
pause at correct position while play button will resume the song
song position reset after a song is played
syncSetVolume will not set both song and sound's volume
Merge branch 'master' of https://github.com/Ilikecattle/EECE381Module2
<DE2 & Android>See Below:
-Fix problem when current song is not in the panel and pressing to play next
-Fix problem when pressing next song/prev song at boundary
-Add five commands
-Fix delay problem when first time loading a sound