(PSP) update video driver :
- start implementing user defined video settings. not all are working
correctly yet.
- avoid blocking on v-sync when a frame takes longer than a v-refresh
period to finish, this will prevent the framerate from dropping all the
way to 30fps when this happens.
(PSP) increase audio buffer size and chunk size.
Merge pull request #808 from aliaspider/master

(PSP) audio/video drivers update