BanList Improvements

-- This is my latest and last attempt with this.

Changes:
- Better GUI
- Added "Search Box"

Known bugs:
- Button logic - for some users this could be confusing
- IP and nickname in one list - this change requires almost total rewrite (widget change)
- Window title should be changed to "Ban List (1337 items)"

More important, my programming skills are not that good as I wanted, so if something is wrong in this patch - simply fix it, commit and move forward - if not leave it and use old ugly Ban List for another two years.

Preview:
![Ban_List_-_0_-_Banned_Users_2013-03-02_08-46-38](https://f.cloud.github.com/assets/521035/212555/5c934330-830d-11e2-9152-e9700da7b794.png)