Function tryParseDouble

Tries to parse a floating point number located at s. s_end should be a location in the string where reading should absolutely stop. For example at the end of the string, to prevent buffer overflows. Parses the following EBNF grammar: sign = "+" | "-" ; END = ? anything not in digit ? digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" ; integer = [sign] , digit , {digit} ;