Revert "Removed AGM_IR_Strobe_Item. Use an IR_Grenade instead"

This reverts commit 339814cbce71ccc2bfd79cddf81b96cc207682ee.

Conflicts:
	AGM_Attach/functions/fn_detach.sqf
Distintion between IrStrobes and IrGrenades on action menus and hints
Added IrStrobe stringtable entries
Improved the visibility of the Ir Strobe
Fixed spacing
Minor correction to stringtable
Merge pull request #450 from esteldunedain/revertIRStrobesRemoval

Revert ir strobes removal