This commit does a number of things:
- remove some dead wchar configury from configure.ac and gdkconfig.h
- repurpose gdkconfig.h as header that contains GDK_WINDOWING_foo
  macros for each included backend, include it in gdk.h and install
  it in $includedir instead of below $libdir
- drop the backend from the library names
- build libgdk-3.0.la as a convenience lib and include it in libgtk-3.0.la
It does not yet enable building multiple backends at the same time.

Instead use the accessors.

Instead of gtk_widget_render_icon() which is now deprecated.

This was causing memory corruption when removing remote plugs from
sockets.

This was causing memory corruption when removing remote plugs from
sockets.

The code for surfaces with alpha content was apparently untested and
screwed up the signs.

Large patch, but just renaming.
Indentation should still mostly be correct because I took care of
keeping the indentation for this function name.

And of course, gtk_widget_pop_colormap() is gone, too.
No replacement is necessary, the function is basically unused.

The function is supposed to replace gtk_drag_set_icon_pixmap().

Replace gtk_widget_shape_combine_region() with
gtk_widget_shape_combine_mask() and
gtk_widget_input_shape_combine_region() with
gtk_widget_input_shape_combine_mask().
As GdkBitmap is going away, and the region equivalents already exist,
this seems like pretty much the default step to take.

Includes code to fix up the users.

The dest_x/y members of GtkDragDestInfo were not initialized.
At the same time, switch some of the small temporary structs
to g_slice allocation.

https://bugzilla.gnome.org/show_bug.cgi?id=630532

The keysyms create a lot of potential namespace conflicts for
C, and are especially problematic for introspection, where we take
constants into the namespace, so GDK_Display conflicts with GdkDisplay.

For C application compatiblity, add gdkkeysyms-compat.h which uses
the old names.

Just one user in GTK+ continues to use gdkkeysyms-compat.h, which is
the gtkimcontextsimple.c, since porting that requires porting more
custom Perl code.

gtk_window_get_group() never returns NULL; if the window isn't in a group,
a default window group is returned instead. Use gtk_window_has_group() instead.
This fixes some previous commits to use accessors to access GtkWindow.

Reported by Philip Withnall in bug
https://bugzilla.gnome.org/show_bug.cgi?id=627828

The functions to set them were gone already, this is just cleanup

Signed-off-by: Federico Mena Quintero <federico@novell.com>

If gtk_drag_begin() gets passed GDK_CURRENT_TIME, try to use
gtk_get_current_event_time().  If it fails, use GDK_CURRENT_TIME when
ungrabbing in gtk_drag_end().

For more see https://bugzilla.gnome.org/show_bug.cgi?id=623865

https://bugzilla.gnome.org/show_bug.cgi?id=623845

Changed the way to find the drop widget from a top->bottom recursion
using GdkWindow positions to a liner bottom->top walk up the widget
hierarchy using _gtk_widget_find_at_coords() and
gtk_widget_translate_coordinates(), which both do the right things for
offscreen widgets.
(cherry picked from commit cb8c0763215bd18219c2d32b56e4bfe8a576f6b3)

Also move docs inline at the same time. Bug 610905.

Use gtk_widget_get_realized() instead

https://bugzilla.gnome.org/show_bug.cgi?id=69872

Use gtk_widget_get_mapped() instead.

https://bugzilla.gnome.org/show_bug.cgi?id=69872