- Fix crash when calling add-next and cur_playing/cur_streaming are NULL
- Append songs after cur_streaming
Merge pull request #28 from chme/fixaddnext

Fix crash when calling add-next and cur_playing/cur_streaming are NULL
Separate player commands for cue-clear and playqueue-clear
Show playqueue history even if player status is stopped
Clear history if mode is 0x68697374