Yaba Sanshiro 2.5 Beta 2

SEGA SATURN模擬器 Yaba Sanshiro 發布新版，更新如下 :

* Use the glMapBufferRange feature to update the VRAM.
* Added K parameter for RAM color mode. Fix a black screen bug.
* Added special color function for mode 3 which used CRAM to detect transparency.
* Activation of the alpha value.
* Fixed flag activation that was ignored
* Added function RBG1 (not tested).
* Casper: correction of the missing loading screen. http://www.tradu-france.com/index.php?page=fullstory&id=633