<Android> delete playlist mostly done +more

rename list nearly done as well

Conflicts:
	Android_Workspace/ece381/src/com/example/ece381/messages.properties
<Android & DE2> See Below
-Fix mixing bug; however, there still problme with it
-Modify loop in the playlist; DE2 will handle it
-Fix but when select a list
-Added/Modify commands
<DE2>Add commands to modify list name and remove list,
Optimize loading mix buffer a bit
<Android> See Below:
Added commands for modify list name and remove list
Fix some bugs