Rename all *window.[ch] source files.

This is an automatic operation, done by the following commands:

for i in $(git ls-files gdk | grep window); do
    git mv $i $(echo $i | sed s/window/surface/);
    git sed -f g $(basename $i) $(basename $i | sed s/window/surface/) ;
done

git checkout NEWS* po-properties po

This renames the GdkWindow class and related classes (impl, backend
subclasses) to surface. Additionally it renames related types:
GdkWindowAttr, GdkWindowPaint, GdkWindowWindowClass, GdkWindowType,
GdkWindowTypeHint, GdkWindowHints, GdkWindowState, GdkWindowEdge

This is an automatic conversion using the below commands:

git sed -f g GdkWindowWindowClass GdkSurfaceSurfaceClass

git sed -f g GdkWindow GdkSurface
git sed -f g "gdk_window\([ _\(\),;]\|$\)" "gdk_surface\1" # Avoid hitting gdk_windowing
git sed -f g "GDK_WINDOW\([ _\(]\|$\)" "GDK_SURFACE\1" # Avoid hitting GDK_WINDOWING
git sed "GDK_\([A-Z]*\)IS_WINDOW\([_ (]\|$\)" "GDK_\1IS_SURFACE\2"
git sed GDK_TYPE_WINDOW GDK_TYPE_SURFACE
git sed -f g GdkPointerWindowInfo GdkPointerSurfaceInfo

git sed -f g "BROADWAY_WINDOW" "BROADWAY_SURFACE"
git sed -f g "broadway_window" "broadway_surface"
git sed -f g "BroadwayWindow" "BroadwaySurface"
git sed -f g "WAYLAND_WINDOW" "WAYLAND_SURFACE"
git sed -f g "wayland_win...

Remove all the old 2.x and 3.x version annotations.
GTK+ 4 is a new start, and from the perspective of a
GTK+ 4 developer all these APIs have been around since
the beginning.

The query function for cursor sizes and capabilities
are not very interesting. At least, they are not used
in GTK+, and all backends but X11 just hardcode
made-up values anyway. So, lets drop them.

As far as possible, use per-display debug flags.

This will minimize the debug spew that we get from
the inspector if it is running on a separate display.

Drop GDK_GL, GDK_VULKAN and GDK_RENDERING_MODE.
Merge the useful bits into GDK_DEBUG.
Drop unused debug flags (CURSOR).

New api needs documentation.

New api needs documentation.

GdkDisplay is missing various annotations, and the introspection scanner
is complaining about it.

It has been replaced by gdk_display_get_keymap.

This is just a better name for gdk_keymap_get_for_display.

Without selections, that's kinda pointless.

No need to copy it.

Make all specific event structs contain a GdkEventAny, so the base
struct can be extended without modifying structs all over the place.

Don't generate marshallers that are not needed.

Use the default ones if they exist.

This commit adds a GdkClipboard object which is intended to
replace GtkClipboard, eventually.

This is now entirely the backends responsibility.

We can just use the seats to find out about device removals.

It is going away.

GdkDeviceManager is being replaced by GdkSeat.

This avoids some string copies at startup.

This is implemented in multiple gdk backends,
and we can avoid and ugly ifdef cascade in gtk
by adding a vfunc for this.

This gives us access to private gdk api.

Move the gdk_display functions to gdkdisplay.c.
They are misplaced in gdkevents.c.

This is needed in the clipboard code. We don't make
it public, since that code is destined to eventually
live in gdk anyway.

Nothing uses GdkScreen anymore, so we can get rid of it.

If you need to flush a display, use gdk_display_flush().

There is never a need to flush displays you don't know about.

This is only implemented on X11, so we don't
need generic api for it.

This function and its variant are just wrappers
around the display-specific function.

This is an unnecessary wrapper around gdk_display_beep.

This is no longer used.

Nothing uses this private api anymore, so we can drop it.

This api is going away.

Also remove the backend implementations.
This api is no longer used.

This is the replacement for the GdkScreen api of the same name.

This is replacing the corresponding GdkScreen api, which
is going away. To implement this, we need to add a
get_root_window vfunc to GdkDisplay.

This includes removing the GdkScreen argument from the
create_window_impl display vfunc.