Hi, as per Johan's request I am moving my work into a separate bug.

Before people start some explosive thread of confusion, I think
its important that I state my motivations behind this patch. 

While the patch does meet my initial standards of quality (I wouldn't
have proposed a patch that I didn't think was worthy of review) It
was intended to be a demonstration - thats why I chose to support 
older glade files as the objective of my work, I think that
if alot of people can see that using the builder framework it was
in fact quite easy to support all the glade files in circulation,
this will help to build trust on the builder framework and its
potential.

So one particular point (hehe or "disclaimer"), is that I have no
strong opinion about supporting deprecated widgets in glade files
using the builder - the patches I wrote against those deprecated
widgets are safe to include and provided as part of this demo,
if people argue that it sends a better message to not support these
widgets, I wont argue against that :)

This patch is also a statement of intent, I want there to be rocking
builder support in gtk+ 2.12 and I'm throwing a patch on the table
to say "hey I'm with you on this", if this patch doesnt fit with
the gtk+ game plan please lets discuss what is best for everyone
and get this ball rolling... on that note.. rock on !

Pasting my basic changelog here from bug 172535
==================================================================
   - Implemented accelerators (work should be done on making sure
     accelerators dont conflict with those created by uimanager).

   - Implemented versioning: <glade-interface version="1">

   - Parse adjustments and pixbufs the old fashioned way for version 1 
     glade files.

   - Handle unsupported atk property tags so that they are not mistaken for
     custom tags (preemptively building the object and the constructor ignoring 
     any trailing properties, such as accelerators).

   - Ported BOOL macros to the private header from libglade (this fixes non 0
     integer values, case insensitive yes/true as valid truth strings from
     the xml, formerly it was only "yes" that was supported, but libglade 
     supports more).

   - Handle packing properties in the builder parser proper, added 
     buildable->child_set_property() method and implemented it in GtkContainer,
     this allows non-gtkcontainers to have packing properties without
     doing that complex parsing jargon and also allows GtkContainer subclasses
     to handle buildable->child_set_property() in thier own way and chain up.

   - Allow virtual properties (packing or otherwise), properties listed in 
     the glade file that dont have coresponding pspecs installed will be 
     delivered to the buildable's set_property()/child_set_property()
     method as G_TYPE_STRING.

     The rationale behind this change is that it allows us to port in all the
     special-case code from libglade without opening up the can-of-worms 
     attached to making these special-case properties "real" object properties,
     this also made it rediculously easy to port all the support code from
     libglade in a safe manner.

   - Icky special case code added for GtkDialog --> GtkButton relationships
     (wrt response-id), added in the buildable code strictly for version 1
     glade files.

   - Dealt with digging out "type" packing properties in the case of
     version 1 glade files. (the new style is <child type="tab">, older
     glade files store "tab" in a packing property).

(will attatch my patch storm to this bug momentarily)