Put all headers from gir xml into manual.h
Put all headers from gir xml into manual.h

Headers generally need some manual tweaking. Some should be removed and
others added, but generally don't change too often. Generate a separate
file with headers, but don't overwrite it again unless it was removed.

EPashkin/gir,GuillaumeGomez/gir,gtk-rs/gir,gtk-rs/gir,EPashkin/gir,GuillaumeGomez/gir,gtk-rs/gir,GuillaumeGomez/gir