V-MPlayer v306 Beta - Subtitle support + -vo fix

Changes since v303:

• Fixed subtitle rendering: libass video filter (vf_ass) now correctly included
• Fixed -vo option being ignored when VAAPI was active
• Fixed font path resolution on AmigaOS4 (PROGDIR: prefix)
• Software video outputs (comp_yuv, comp_yuv2, cgx_wpa) now correctly disable VAAPI hwdec

Note: A valid subfont.ttf must be placed in the conf directory of V-MPlayer.

Support: https://www.paypal.com/paypalme/Maijetsro

Please test and report any issues.