implement various compare and branch instructions
implement various compare and branch instructions

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