[PATCH][RFC] Extract methods from LatLon into ILatLon where they are generally applicable

[taylor.smock]

The attached patch does the following:

• Moves greatCircleDistance and bearing into ILatLon from LatLon
• Where possible, remove getCoor() calls and instead call the appropriate method directly
• Deprecates the original methods (rather unfortunately, this does mean we will have deprecation warnings when compiling for a bit, as most of the remaining calls deal with EastNorth conversions)
• Where possible (when noticed), if something calls Node#getCoor and then directly passes the result into something that accepts ILatLon, the Node is now passed instead.

This does not move interpolate and getCenter, as both return a LatLon.

For those reading the code, Node extends INode which extends ILatLon.

This should decrease overall memory allocations significantly. One major win is in SearchCompiler#match, where a Bounds#contains(LatLon) is replaced by Bounds#contains(ILatLon), where the ILatLon is the Node (in a validation test of Mesa County, Colorado, the getCoor call accounted for 284 MiB of 740 MiB memory allocations for SearchCompiler#Match).

Note: I'm not sold on the @deprecation annotations. I'd like to be able to remove the methods from LatLon someday, but those methods are used a lot, so there will be a lot of breakage when we do remove them.