Preparing for 1.1

- Code optimization.
- Feature: Users can now filter portal threads by; 'author', 'prefix',
'forum', (has) 'poll' or (is a) 'sticky' thread.
- Feature: Users can now order portal threads by; 'dateline', 'lastpost'
or 'replies'.
- PluginLibrary 12 is now required for the plugin to work.