Optparse v2

[bitwes]

I wanted a better optparse to use in other places so I beefed up the one GUT uses. If you need to parse command line options you can copy addons/gut/cli/optparse.gd. It has no dependencies in GUT. See scratch/optparse_example.gd for some usage examples.

Changes for GUT

• options that take a value can now be specified with a space (option value) instead of using option=value.
• -gh option now has headings for the different options. It looks a lot better.
• -gdir and -gtest can be specified multiple times instead of using a comma delimited list.

Changes to optparse.gd

• A giant amount of documentation added to the top of optparse.gd. Read that for full info about usage.
• Supports headings to group like options together.
• Supports positional options.
• Parses values that follow an option. Using option=value is now an optional way to specify an option value.
• Empty array values can now be specified with option=. Before you would always get [''] as the value.
• Generates "Usage" section in the help.
• Boolean options can default to true and will be set to false if specified.
• Looks like I forgot to test optparse.gd originally, it now has a full set of tests.
• Array values are appended if specified multiple times.