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constructor.

ObjectG.opCast now handles this use case.

ObjectG.getInterfaceInstance now provides that implementation.

This can be usefull for example with gstreamer.ElementFactory if you use if to make an "xvimagesink" that returns an Element that implements the VideoSink interface,
but the actual type returned is private. Now you can use the interface by casting the Element to that interface.

For cases where the glib/gtk function returns the base type instead of
the actual derived type, this allows you to cast to the derived type.

With the addition of the template for GObjects, bool and enums now match
both the int and the uint constructor.

Add a constructor for bool, and turn the integer and floting point
constuctors into templates to work around this.

Like with the Liststore TreeStore.setValues now accepts any value
supported by the gobject.Value constructor.

Closes #214

It now supports any vaule supported by the constructors of
gobject.Value.
Also add a few more types to gobject.Value.

Closes #213

With the static array the classes are never freed.

See #211

threadsAddIdle expects an callback returning gboolean/int with a
return type of bool this doesn't seem to work.