Ares 1.9.8

- Fixed several bugs in .avi files preview code (Ares retrieves first part of downloaded .avi file and seeks for idx1 data in it in order to rebuild and preview it)
- Improved fullscreen window (cursor hides automatically, added setvolume menu item)
- Changed appearance of media player's volume control
- Moved some tags from chatroom's name field to topic field (eg [ASAX], [AE] etc) as an attempt to make list easier to read
- Improved mouse wheel GUI handling
- Added 'URL' admin command to chatroom