... include mouse pointer.
This is working find and tested under GNOME which already had the code
for it (was only missing the GUI). I added the feature in OSX and X11,
though it is untested. Windows does not seem to have the capability (at
least according to screenshot_win32_get_capabilities() in our code).
Add color management options to the screenshot plug-in:
By default, it tries to tag the image with the monitor profile;
alternatively, there is an option to convert the image to sRGB.
This works mostly fine on *one* monitor given its profile is
configured correctly. With more than one monitor, funny things happen
depending on the platform and on what we are shooting (window, screen,
area). There are some FIXMEs left in the code.
Add error reporting to all screenshot backends, but only really use it
in the gnome-shell backend: check all DBus calls for errors instead of
crashing.
Also fix detection if gnome-shell is running: just creating the
GDBusProxy always succeeds, so call org.freedesktop.DBus.Peer.Ping
on the newly created proxy.
Some more abstraction in the screenshot plug-in, now allows for
runtime backend selection. Add stubs for the gnome-shell backend,
registers itself as unavailable because it's still unimplemented.
Move OS X and X11 specific code to its own files, to prepare for more
shooting backends being added. Also remove unimplemented G_OS_WIN32
stubs, if anyone feels like implementing a Windows backend, by all
means go ahead.
