Some functions added for playlist and minor display changes

- Added RANDOM ALL function to add all tracks in playlist in random way
- Added RANDUM CURRENT function to randomize current playlist
- Added NEXT SONG function to ... guess what !
- Addedd CLEAR LIST to empty current playlist
- Moved all buttons to the top of the page
- Changed page width to 90% instead of fixed 1000px size
- Added  a new permission type for the RELOAD function