Contains templates, clipart galleries, palettes, symbol font, autocorrections, autotexts etc.

How-to add a new gallery:
	+ create a directory extras/source/gallery/foo/
	+ create a .str file extras/source/gallery/foo/foo.str
	+ add a [foo] section to extras/source/gallery/share/gallery_names.ulf
	+ add a Gallery_foo.mk at the top-level (and mention in Module_extra.mk)
	+ add a new GALLERY_FILELIST statement in scp2/

How-to add a new autotext category
	+ create a directory extras/source/autotext/lang/xx/foo/ where xx is your lang code
	+ unzip your foo.bau autotext file in this directory (including an empty mimetype file)
	+ add xx/foo.bau in extras/AllLangPackage_autotextshare.mk
	+ in extras/CustomTarget_autotextshare.mk:
		+ add xx/foo in extras_AUTOTEXTSHARE_AUTOTEXTS
		+ add all files contained in foo.bau (except mimetype) in extras_AUTOTEXTSHARE_XMLFILES
		+ if foo.bau contains files with other extension than .xml, .rdf, .svm and .png
			+ add a CPY call at the end of the file

How-to add a new autotext to an existing category
	+ create a directory extras/source/autotext/lang/xx/standard/FOO/ to add it in category standard of lang xx
	+ add files of the autotext (at least FOO.xml for an unformatted autotext)
	+ add autotext name in extras/source/autotext/lang/xx/standard/BlockList.xml
	+ add all files of autotext in extras/source/autotext/lang/xx/standard/META-INF/manifest.xml
	+ in extras/CustomTarget_autotextshare.mk:
		+ add all files of autotext in extras_AUTOTEXTSHARE_XMLFILES
		+ if some files have different extension from .xml, .rdf, .svm and .png
			+ add a CPY call at the end of the file

How-to add a new Impress template
	+ clean-up template file as indicated on wiki https://wiki.documentfoundation.org/Documentation/HowTo/Impress/Make_template_language_independent
	+ unzip Foo.otp in extras/source/templates/presnt/Foo (no space allowed in any file names)
	+ add Foo.otp in Package_tplpresnt.mk
	+ in CustomTarget_tplpresnt.mk:
		+ add Foo / in extras_TEMPLATES_PRESENTATIONS
		+ add files names contained in Foo.otp (except mimetype) in extras_PRESENTATIONS_XMLFILES
		+ if Foo.otp contains files with other extension than .xml, .svm, .svg, .png and .jpg
			+ add a CPY call at the end of file