clean up offsetToFrameIndex code
clean up offsetToFrameIndex code

MaartenR/avian,bigfatbrowncat/avian-pack.avian,dicej/avian,badlogic/avian,minor-jason/avian,badlogic/avian,minor-jason/avian,ucdseniordesign/avian,lwahlmeier/avian,ucdseniordesign/avian,ucdseniordesign/avian,getlantern/avian,lostdj/avian,lostdj/avian,joshuawarner32/avian,dicej/avian,bigfatbrowncat/avian-pack.avian,joshuawarner32/avian,bigfatbrowncat/avian-pack.avian,joshuawarner32/avian,minor-jason/avian,bgould/avian,lostdj/avian,minor-jason/avian,lwahlmeier/avian,badlogic/avian,MaartenR/avian,getlantern/avian,badlogic/avian,marcinolawski/avian,marcinolawski/avian,marcinolawski/avian,getlantern/avian,bgould/avian,bigfatbrowncat/avian-pack.avian,lostdj/avian,getlantern/avian,bgould/avian,MaartenR/avian,bgould/avian,lwahlmeier/avian,MaartenR/avian,joshuawarner32/avian,marcinolawski/avian,ucdseniordesign/avian,lwahlmeier/avian,dicej/avian,dicej/avian