Added "Mark as Resolved" Support

Hi everyone,

There is now the ability to mark a reply to your posts in the General, Programming or Help sections as an answer to your question.

The post will show a nifty checkbox icon (to show it has been resolved), and provide a link after the first post to skip down to the answer.

It’s still not StackOverflow, but I think this will help make our forums even stronger. Thanks everyone!