to make GTK+ happy

Entrypoint got renamed in weston
8af2beccbd91c2f555eb5e5aa4f8e0455ab28eff

Oops.

The previous weston 1.12 fix breaks building with older weston. This
commmit defines HAVE_NEW_WESTON if weston-1.12 is found and apply
weston-1.12 fix as needed. If older weston is found, a warning message
is displayed and HAVE_NEW_WESTON is undefined.

Weston 1.12 introduces some modification to the source tree. The
compositor.h is now moved to /usr/include/libweston. Some struct members
also renamed from ``configured`` to ``committed``.

This fix will break building maynard using weston < 1.12.

This is based on explanatory patch on GH#46 and should fix shell crashes
when dragging a window.

Drop hardcoded dependency on a wallpaper

Rename the BACKGROUND environment variable to MAYNARD_BACKGROUND and
set it to a default image if the variable is not set and the default
image exists.

This sets the default to a solid blue color. A custom wallpaper can be used by
starting weston via
`BACKGROUND=/usr/share/wallpapers/Hanami/contents/images/3872x2592.jpg weston`

Update to current Weston

Weston renamed desktop_shell to weston_desktop_shell, pulling its
version back down from 3 to 1 in the process. Import our own copy of
that, and make sure we can use either, depending on the Weston version.
Signed-off-by: Daniel Stone <daniels@collabora.com>

This used to come with Weston, but no more.
Signed-off-by: Daniel Stone <daniels@collabora.com>

Signed-off-by: Daniel Stone <daniels@collabora.com>

We need this for desktop-shell version 3 (with set_panel_position) and
for the changes in weston 412e6a59eb90d.

This is to reflect 412e6a59eb90d in weston. If you're using an older
weston you can safely revert this commit.

The animation now are kind of shonky. They should be more synced with
the launcher grid opening and closing but it's difficult to cancel
weston animations while they're still running. This is next to be
fixed.

We weren't using this pointer so it wasn't obvious it was
wrong. wl_list and container_of confuse me every time.

Just try one wl_display_roundtrip, rather than doing them in a tight
loop until we fall off the face of the planet.

The weston_surface's configure function defined by weston's
desktop-shell module had loads of things we don't want such as moving
the surface to 0,0 and removing all other surface's from the panel
layer. By setting our own configure function we can only do the things
we want.

If sound doesn't work is nicer to show a “no sound” icon.

Without this the initial volume icon is wrong (and the status is
inconsistent).

The old code looked fine in a small weston-in-x11 window, but rubbish
on a bigger screen.

It was slightly too big for the clock window and making it bigger.