- require GTK-Doc 1.19
- remove sgml mode
- automatically generate gi.types (needs GTK-Doc 1.19)
- fix https://bugzilla.gnome.org/show_bug.cgi?id=700025
[WIP] - rearange sections a bit
[WIP] - add gi-building, gi-programming sections
[WIP] - mark missing docs with TODO, which is only marginaly
better than nothing but at least can be grepped :)
https://bugzilla.gnome.org/show_bug.cgi?id=571648
