Change contiguity of GTT's OBB cross-reference to be constructor option

Current code allows for a transition between contiguous (faster vector lookup) and non-contiguous (low memory map lookup) during operation. To do this requires frequent checking of whether or not the geometry managed by a GTT is contiguous, which is expensive.

It is rare that the non-contiguity will be substantial enough to cause a real memory problem, and even more rare that an initially contiguous set of geometry will change enough to be a problem.

This should be refactored to use the vector form as a default in the constructor, but allow the map form as an option, and to NOT allow switching during operation.

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