Initial changelog for release 0.9.9
Initial changelog for release 0.9.9

richardpl/libass,Distrotech/libass,MrSmile/libass,asimonov-im/libass,blinkseb/libass,Akemi/libass,torque/libass,stps/libass,Akemi/libass,mwgoldsmith/libass,vault/libass,grigorig/libass,astiob/libass,MrSmile/libass,Distrotech/libass,pigoz/libass-ct,vault/libass,rhlee/libass,ShiftMediaProject/libass,blinkseb/libass,mwgoldsmith/libass,tgoyne/libass,ShiftMediaProject/libass,sanyaade-g2g-repos/libass,astiob/libass,mwgoldsmith/libass,libass/libass,asimonov-im/libass,xbmc/libass,richardpl/libass,rhlee/libass,Distrotech/libass,grigorig/libass,libass/libass,rhlee/libass,pigoz/libass-ct,tgoyne/libass,richardpl/libass,stps/libass,sanyaade-g2g-repos/libass,torque/libass,blinkseb/libass,pigoz/libass-ct,sanyaade-g2g-repos/libass,xbmc/libass,torque/libass,stps/libass,Akemi/libass,tgoyne/libass