Pastelink.net Updates and Fixes

- The icon option for links has been removed. An option for no links to be made clickable has been added instead. This will not affect any of the current pastes with the icon option selected.

- Added support for twitter hashtags, they will now become clickable automatically. Pastes made before this update will not be affected. As with normal links, putting << at the end of a hashtag will prevent it from being clickable and choosing the new 'none' link option will prevent any changes.

- A space will now automatically be added after a : before a link. This will stop the : from breaking the link.