Toolbar buttons tooltips and usage

[maxdeepfield]

New user can understand icons without explanation wrong, especially toolbox, gear and switch buttons. Also red X on toolbar which turns off Halite seems not to be very useful.

[wodim]

Toolbar buttons are very bad: ugly (Tango? really??), no tooltips, not well ordered imo...

For example I would expect the X to remove a torrent, not to quit; quit button should be a door with an arrow... etc