Improve the NMake Makefiles that is used to re-generate demos.h(.win32)
by re-generating the gtk3-demo Visual Studio projects, so that one would
no longer need to do that manually.
Update the build instructions accordingly.
Instead of relying on the ones that are currently shipped with the tarballs,
generate them from their .in counterparts prior to the build. This includes
the Resource Scripts (.rc) for libgdk/libgtk, as well as gtkversion.h, in
addition to gdkversionmacros.h which can now be generated during prebuild.
Rename the script as gen-version-items.py, and so make things more generic and
usable by other items in the build. We want to eventually to be able to
generate the .rc files and the *version*.h files from their *.in counterparts
using this script.
This improves the source generating process by:
* Generating the sources in the libgtk build directory, so that we do not
pollute the source tree.
* Support generating gtk[private]typebuiltins.[c|h] in the Visual Studio
projects by using NMake internally.
* Update the projects and the introspection build files so that the generated
sources and headers can be found.
This will enable us to not confuse with the deprecated headers in
gtk/deprecated as those headers are also listed under deprecated_h_sources in
gtk/deprecated/Makefile.inc, when we include the makefile snippets in both
gdk/ and gtk/.
This makes the rest of the sources that are generated being put in GDK's build
directory for the Visual Studio projects, instead of being placed in GDK's
source subdir, so that:
* We can avoid polluting GDK's source tree.
* The Visual Studio builds won't interfere with the Meson builds.
Update the project files to look for the generated sources and headers in the
right places, as well as making the introspection builds look for the generated
sources as well.
Also remove the gtk3-gen-srcs property sheets and put the relevant parts in the
corresponding gtk3-build-defines property sheets, to clean things up a bit.
This way, we can have the introspection NMake Makefiles share more items
with the source generating bits.
Update the Visual Studio projects accordingly
We can regenerate demos.h.win32 with or without the font features demo
by using the regenerate-demos-h-win32 target with or without secifying
the FONT_FEATURES_DEMO=1 flag on the NMake command line.
Differently from the meson case, here we just include the emoji data
files into the global gresources file, get_emoji_data() supports this
and it's just easier to handle in these build systems.
Update the NMake Makefiles to invoke glib-compile-resources with
'start /min' so that when gdk-pixbuf-pixdata, json-glib-format
and xmllint are invoked by glib-compile-resources, cmd.exe windows
will not popup whenever these auxiliary tools are invoked, when one
builds GTK with the Visual Studio projects.
This will reduce the distraction that is caused during the time the
source files are generated, as a popup cmd.exe window will disrupt the
window focus as they appear, and will make the process a bit quicker.
