Argument parser (getopt/regex).

Argument parser (getopt/regex). Criteria: - Can be algorithm based or regex. - Language can be either Delphi/FPC or C/C++. - No global variables. - No classes, structs are fine. - Thread safe. - Cross platform. - Single header/unit. - Unicode support. - High performance. - Little or zero allocations. Capabilities: - It should have all the capabilities of (getopt + simpleopt). - Parse options after non-option/positional arguments - Keep track of an option occurring multiple times - Keep track of the order of options - Built-in argument type checking and parsing - Must handle white spaces between options, delimiters and arguments. - Must support (-opt:arg1, -o:arg1, -o : arg1, ...)