Remove remnant of Autotools (#2950)

* Remove `glib-mkenums` autotools templates and generated files

Meson uses the `enumtypes.c.in` and `enumtypes.h.in` in
`libvips/include/vips` and doesn't use the pre-generated
files.

* Remove man files for no longer existing tools

+ update the `meson.build`.

* Remove Autotools section in `.gitignore`

* Remove `po/messages` left-over

* Remove `g-ir-scanner` entry point

No longer needed by Meson.

* Remove `glib-genmarshal` generated files

Meson doesn't use these pre-generated files.

* Remove Autotools specific Git attributes

* Remove no longer existing tools in `.gitignore`

* Remove Make specific things in `.gitignore`

* Rename COPYING to LICENSE

* Remove no longer needed `.gitignore` sections

Meson only supports out-of-tree builds. This assumes that the
build directory is ignored.

* Remove no longer needed `.editorconfig` sections

.editorconfig

@@ -13,11 +13,3 @@ indent_size = 8
 [*.py]
 indent_style = space
 indent_size = 4
-
-[Makefile.am]
-indent_style = tab
-indent_size = 8
-
-[configure.ac]
-indent_style = space
-indent_size = 2

.gitattributes

@@ -1,5 +1,2 @@
-# Shell scripts and Automake sources can't have CRLF line endings
-configure.ac	eol=lf
-Makefile.am	eol=lf
-*.m4		eol=lf
+# Shell scripts sources can't have CRLF line endings
 *.sh 		eol=lf

.gitignore

@@ -25,120 +25,6 @@ __pycache__/
 .pytest_cache/
 ### End of Python
 
-### Autotools
-# https://www.gnu.org/software/automake/
-.deps/
-.libs/
-*.log
-*.trs
-.dirstamp
-Makefile.in
-py-compile
-test-driver
-
-# https://www.gnu.org/software/autoconf/
-autom4te.cache/
-aclocal.m4
-compile
-config.guess
-config.h
-config.h.*
-config.log
-config.status
-config.sub
-configure
-depcomp
-install-sh
-missing
-stamp-h1
-
-# https://www.gnu.org/software/libtool/
-libtool
-ltmain.sh
-
-# https://www.gnu.org/software/m4/
-m4/glib-gettext.m4
-m4/gtk-doc.m4
-m4/intltool.m4
-m4/introspection.m4
-m4/libtool.m4
-m4/ltoptions.m4
-m4/ltsugar.m4
-m4/ltversion.m4
-m4/lt~obsolete.m4
-m4/pkg.m4
-
-# Generated files
-Makefile
-libvips/include/vips/version.h
-test/variables.sh
-### End of Autotools
-
-### gettext
-po/Makefile.in.in
-po/*.pot
-po/POTFILES
-po/de.gmo
-po/en_GB.gmo
-po/malkovich.gmo
-### End of gettext
-
-### Tools
-tools/batch_crop
-tools/batch_image_convert
-tools/batch_rubber_sheet
-tools/light_correct
-tools/shrink_width
-tools/vips
-tools/vipsedit
-tools/vipsheader
-tools/vipsthumbnail
-fuzz/*_fuzzer
-### End of Tools
-
-### GTK-Doc
-doc/html-build.stamp
-doc/html.stamp
-doc/html/
-doc/libvips-decl-list.txt
-doc/libvips-decl.txt
-doc/libvips-docs.sgml
-doc/libvips-docs.xml
-doc/libvips-overrides.txt
-doc/libvips-sections.txt
-doc/libvips-undeclared.txt
-doc/libvips-undocumented.txt
-doc/libvips-unused.txt
-doc/libvips.actions
-doc/libvips.args
-doc/libvips.hierarchy
-doc/libvips.interfaces
-doc/libvips.prerequisites
-doc/libvips.signals
-doc/libvips.types
-doc/scan-build.stamp
-doc/setup-build.stamp
-doc/sgml-build.stamp
-doc/sgml.stamp
-doc/tmpl-build.stamp
-doc/tmpl.stamp
-doc/tmpl/
-doc/xml/
-gtk-doc.make
-libvips-scan
-### End of GTK-Doc
-
-### GObject introspection
-libvips/introspect
-Vips-8.0.gir
-Vips-8.0.typelib
-### End of GObject introspection
-
-### pkg-config
-# Generated files
-*.pc
-### End of pkg-config
-
 ### VIM
 # Temporary files
 *~