Add function to staticize variables in math parser
Use case: when a string drive is used, if the string contains a variable that may need to be changed during parsing (e.g., a counter for repetitive objects, CURR_BLADE for example) and we want to use the value of that variable, we could use "static(CURR_BLADE)", or "eval(CURR_BLADE)" to take the variable's value, rather than dereference it all times (getting the unexpected value instead).