Horizontal Workspaces
(Split from !1547 (closed))
This makes workspaces horizontal, and adapt the APPS page of ViewSelector to hold WorkspaceDisplay, ThumbnailsBox, and AppDisplay.
For now, no animations were introduced. This is simply about making workspaces horizontal, adjusting the thumbnails to reflect that, improve the UI slightly, and fix a few issues here and there.
Edited by Georges Basile Stavracas Neto