Added -H/--hidden options that do nothing. Normalized some quotes too.
Added updated usage.
Upload form now ticks hidden box based on -H flag.
Merge branch 'hidden-flag' into develop

Adds the ability to tick the hidden box on nyaa via CLI, instead of
just assuming hidden (or not, if you want to edit) in the code.

There's not a particularly good reason to hide if you're pushing
straight to TT after all, especially since metadata is pushed
straight away too.