improve command line parsing

[allanon]

Improve command line parsing:

1. Use Misc::parseArgs to parse the parameters in an openkore-standard way.
2. Use Getopt::Long to process the parameters in a CLI-standard way. For example, -override becomes --override.
3. Allow -- to separate macro parameters, but do not require it. For example, macro foo a b c will set $.param1 = a, $.param2 = b, and $.param3 = c.