sourceModifierName (char*) — The source timecycle name.
clonedModifierName (char*) — The clone timecycle name, must be unique.
Examples
local sourceName = "underwater"
local cloneName = "my_awesome_timecycle"
local clonedIndex = CloneTimecycleModifier(sourceName, cloneName)
if clonedIndex ~= -1 then
SetTimecycleModifier(cloneName)
end