gdkinternal-quartz.h isn't installed but the headers that included
it are, which which would cause the build to fail if an external
project included one of them.
Also changed the includes in gdkinteral-quartz.h to local for
faster loading.
Closes: https://gitlab.gnome.org/GNOME/gtk/issues/1737
Don't export any functions taking or returning MacOS types in
gdkquartz.h, gdkprivate-quartz.h, or any header that either includes.
The GdkQuartz internal functions are moved to a new header
gdkinternal-quartz.h, the functions used by quartz-specific
Gtk files are moved to another new header gdkquartz-gtk-only.h, and
the key and event enums to a new header gdkkeys-quartz.h.
Transform GdkQuartzMonitor geometry to Gdk coordinate system.
Move computation of Display geometry from GdkQuartzScreen to
GdkQuartzDisplay and use AppKit coordinates.
Closes https://gitlab.gnome.org/GNOME/gtk/issues/1593
Instead we just cache the monitor number and get
out of it the nsscreen when it is needed. This is
a requirement since it nsscreen it is not supposed
to be cached.
Fixes: https://gitlab.gnome.org/GNOME/gtk/issues/1312
