[GraphHopper] Speed of OS ITN routing

[Stuart Adam]

As I suspected part of the issue with our speed when not using contraction hierarchies is that currently our code is introducing all nodes as towers rather than a mix of towers and pillars.  This is an easy fix however does seem to break some of ITN's turning restrictions so I won't be commiting that yet.  Obviously correct and legal is better than fast :-) 
 		 	   		  
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