Panel window list v2

[Scott Moreau]

Hi,

I have rebased the window list series and made the changes discussed with
Kristian on IRC. I included the wayland patch in with the weston patches
so it is obvious which weston patch depends on it.


v2:

- Rebased patches to latest master
- Remove keyboard focus when minimized
- Center list item icon vertically in button
- Don't change default font
- Get rid of struct surface_data and store a
    resource pointer on shell_surface instead
- Added new icon for default
- Tweak text position