implement addCM
implement addCM

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