Neat 0.3.2: Arguably Minor

The help page (neat -h) had become more and more out of date with the actual options available.
Now that neat uses the new std.argparse for its own command line processing, we can just generate the help page from the actual options available.

• std.argparse allows parsing command-line arguments (in Unix or GCC style).
• std.macro.assert is now an expression.
• Templated methods may now appear inside classes.
  • Though of course they won't be virtual.
• Template type inference can now recurse into delegate types.