[script] add 2 new operators

- Str : Int ->  works like py's [Int:]
- Str - Int -> subtracts x amount of characters from the end of the string

source/script/types.h

@@ -37,6 +37,7 @@ enum Tokens {
 	RSBracket,
 	AND,
 	OR,
+	Selector,
 	EquationSeperator,
 };