Update chemlights.sqf to work with IR Strobes

IR strobes were added to the chemlight add list and will be removed properly when chemlights are detached. I used this for help for removing the IR strobes: http://forums.bistudio.com/showthread.php?125183-Player-addAction-attach-IR-Strobe-to-player
Merge pull request #2 from Rafael09ED/patch-1

Update chemlights.sqf to work with IR Strobes