Having a fixed width is bad for various reasons. First, it's
harder to deal with low resolution screens, which was fixed
by adding an entire new mode just to deal with it. Second,
because it may not scale well for big resolutions.
Fix that by removing the code that handles the fixed width.
The next commit will completely remove the code that manages
small screens, in the hope that the new layout will handle
both cases well by design.
https://bugzilla.gnome.org/show_bug.cgi?id=766922
To progressively achieve the sidelist, let's start by moving
the current iconview selector to the side and then turning
it into a GtkListBox.
This commit, then, moves the iconviews' list to the start of
the horizontal box added in the previous commit.
https://bugzilla.gnome.org/show_bug.cgi?id=766922
The copied files are exact copies of shell/cc-window.c and
shell/cc-window.h, and they'll be used to implement the restyled
shell as an alternative binary.
https://bugzilla.gnome.org/show_bug.cgi?id=766922
