Make tracker updates follow update-check rules
The update-check option only applied to full autodl-irssi updates, trackers were updated regardless of this setting.
This means that users will only get tracker updates if they set update-check = auto, update with the /autodl update command, or manually update them.
Improve update status messages
Make 'not downloaded' message more noticeable [Closes #51]
Improve trackers update status messages
Add rt-throttle option
Separate WEB-DL and WEBRip constant groups [Closes #57]
Make new slash commands available to gui-server
Add forever to max-downloads-per filter option [#44]
This does the same as not setting max-downloads-per.
This was needed to clarify the option in the ruTorrent plugin.
Update autodl-trackers submodule
Bump version