CORE-11698, CORE-15369
Allows a user to set the icon size and show or hide the desktop button in
the taskbar using the taskbar properties menu. After applying these changes,
the taskbar updates and resizes without requiring a restart.
- This PR moves the 'Notification Area' section into its own separate tab.
This allows us to include more options for users without increasing the
size of the window. It is also very similar to the Windows Vista taskbar
properties menu.
- Some minor changes to allow the taskbar to refresh its view when the icon
size or show desktop button setting changes.
