Add random_choice helper function to effect template

effect_template.lua

@@ -35,3 +35,14 @@ function OnTick()
 end
 
 -- Add custom helper functions below.
+
+function random_choice(p1)
+    if type(p1) ~= "table" or #p1 == 0 then
+        return nil
+    end
+    local choice = p1[math.random(#p1)]
+    return choice
+end
+
+
+