rc4

1. Improved the sound performance.

rc3

1. Fixed the last button user pressed will be reported again when VOL-/VOL+ is pressed.
2. Fixed the issue of 1.5 times speed by setting the frameskip to 2 (4 by default).
3. Fine-tuned the sound library.

rc2

1. Added "noaudiofix: 1" option in config.json for Stock system.
2. Added "stop_audioserver.sh" command in launch.sh for Onion system.

rc1

1. Implemented the customized version of alsa library for DraStic emulator.
2. User can change the background image:

bg_s.png: background image for single screen (without stretch mode)
bg_v.png: background image for vertical screen (without stretch mode)
bg_h.png: background image for horizontal screen (without stretch mode)
bg_vh.png: background image for vertial/horizontal screen (with stretch mode)

3. User can change the image of stylus pen:

pen.png: stylus image (no matter what WxH size you use, 32x32, 64x128 are all fine)

4. User can change the stretch mode by pressing SELECT+START.
5. User can swap the screen by pressing R2.
6. User can use stylus pen by pressing L2.

In this mode, only the buttons of L2, D-PAD and A work.
User need back to D-PAD mode by pressing L2 again.