Move the autocleanup declarations into their
respective headers.
While we are at it, correct the autocleanup
declaration for GdkEvent to use gdk_event_unref,
not g_object_unref. Oops
We use a compilation symbol in our build to allow the inclusion of
specific headers while building GTK, to avoid the need to include only
the global header.
Each namespace has its own compilation symbol because we used to have
different libraries, and strict symbol visibility between libraries;
now that we have a single library, and we can use private symbols across
namespaces while building GTK, we should have a single compilation
symbol, and simplify the build rules.
