Added support for plugins to JPCSP:
- Added custom support for XBRZ4JPCSP by shenweip (https://github.com/shenweip/XBRZ4JPCSP).
- Added new plugins menu.

Avoid crashing when reading invalid icon data in sceUtility.

Improved SAVEDATA DELETE modes.

Changed PARAM.SFO hashing in SAVEDATA.

git-svn-id: http://jpcsp.googlecode.com/svn/trunk@3438 4ab978e6-3352-0410-996c-0b42db0051c8