Yabause 0.9.1 released

[JKKDARK]

New version of the Sega Saturn emulator.

Changelog:

* scsp:
- Fixed slot pitch LFO. Amplitude LFO is probably more accurate now too.

* emulated bios:
- Added Backup RAM manager functions.

* opengl video core:
- Fixed a bug with VDP2 2x2 plane size rotation screens.
- Optimized tile mode rotation screens
- Added support for VDP1 polyline.

* software video core:
- FPS display now working.
- Added support for VDP2 rotation without coefficient tables.
- Fixed a bug in VDP2 24 BPP bitmap mode.
- Fixed several clipping bugs in Normal and Scaled Sprites.
- Fixed a bug with VDP2 2x2 plane size rotation screens.
- Optimized tile mode rotation screens.

* linux port:
- Cursor now disappears after 2 seconds of inactivity in the gtk port.

* macos port:
- New high resolution icon.
- Add some missing OS X application property list keys.

* windows port:
- Fixed window position bug.
- Other bug fixes.

* general:
- Tweaked frame timing code so it's more accurate.
- Re-implemented save states.
- Some internal changes do so that sound, video, and cd cores can be changed at runtime.

[RockinB]

Let's give it a try! Yabause is my first choice to test my homebrew Saturn stuff.