To set up the "depth" functions if a Program has .zIndexEnabled.
Program
.zIndexEnabled
@:value(0)staticinlineread onlyNEVER:Int = 0
@:value(1)staticinlineread onlyLESS:Int = 1
@:value(2)staticinlineread onlyLESS_EQUAL:Int = 2
@:value(3)staticinlineread onlyGREATER:Int = 3
@:value(4)staticinlineread onlyNOTEQUAL:Int = 4
@:value(5)staticinlineread onlyGREATER_EQUAL:Int = 5
@:value(6)staticinlineread onlyALWAYS:Int = 6