GtkBuilder: Added api to allow private signal callbacks
In preperation for composite objects, for better encapsulation the following APIs are added to allow handling of signals declared in the XML with callbacks declared statically. o gtk_builder_add_callback_symbol[s]() Adds a symbol to the internal symbol hash o gtk_builder_lookup_symbol() Looks up a symbol, exposed in case added symbols are used in conjunction with gtk_builder_connect_signals_full() The default implementation of gtk_builder_connect_signals() now does not have a strong requirement on GModule (or a strong requirement on symbols being declared in the global namespace). Instead GModule is used as a fallback in the case that symbols are not declared explicitly.
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