Add toolbar files

- Implement showBanlist(channel)
Add away toolbar button
Add toolbar in query and server tabs
Add back functionality to away button
Add rejoin button
Replace showBanlist with clearLines
Fix away icon is smaller than the rest of the toolbar icons
Fix settings cookie is not updated

The settings object is now stored in ToolbarCtrl and saved using Settings.save
Add `vertical-align: baseline !important` to the icons in the toolbar