Just commented out the tap-and-hold code for now.

Pushed a few more commits. Need to work on solution for HildonUIMode and HildonInputMode related features. For now I've added HildonUIMode enum to hildon-gtk.h to allow some features to build but a working compatibility solution would be needed for allowing devs to set the values using the existing funtionality and mapping the values to GtkInputPurpose and GtkInputHints.