* Update .gitignore
* Separate gnome-shell 3.30 theme from 3.18
To allow making backwards incompatible changes
* Update gnome-shell slider for 3.30
As per upstream gnome-shell commit c90a4e48493072f02b87c2538b395b1549353b34
* Update gnome-shell OSD level-bar for 3.30
As per upstream gnome-shell commit
ed8e89bc195a9e56244109e63d1cb0026f498331
* Add -barlevel-overdrive for gnome-shell 3.30
As per upstream gnome-shell commit
ddd4fd9c2435eccc8f1ba296d64354d77061faf1
* Follow symlinks when installing shell assets
Since asset directories for gnome-shell 3.30 theme are symlinked,
'cp -L' must be used to install the assets properly.