build: Modernise the API reference
authorEmmanuele Bassi <ebassi@gnome.org>
Mon, 22 May 2017 09:26:21 +0000 (10:26 +0100)
committerEmmanuele Bassi <ebassi@gnome.org>
Mon, 22 May 2017 12:44:20 +0000 (13:44 +0100)
Let's use modern, idiomatic gtk-doc to generate the API reference:

 - use XInclude
 - stop using SGML mode with XML files
 - drop version.xml and use the gtk-doc package entities


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