SSS Menu 3

Changed menu display, now you don't need to enter START to choose mode.
I'm considering adding an achievements button, maybe later.

 New options, fixed some bugs.

Difficulty select and start buttons. Only in arcade mode.
Explore mode and arcade stage 1 are under construction.


Changelog:
- Changed start button replaced with arcade and explore buttons
- Added realtime adjust music/sound volume
- Added fade in confirm box
- Added difficulty normal and hard pictures
- Fixed music/sound adjustment bar strange movement
- Fixed windowed/fullscreen can be checked both at the same time