Add string.format shortcut to lua

processor/processor.go

@@ -205,6 +205,7 @@ function floor(x) return math.floor(x) end
 function ceil(x) return math.ceil(x) end
 function upper(s) return string.upper(s) end
 function lower(s) return string.lower(s) end
+function format(s, ...) return string.format(s, ...) end
 
 -- String to number conversion helper
 function num(str)