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Add ability to calculate local misorientations across grain boundaries. #1304

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@imikejackson

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@imikejackson

I am wondering if there is a way to visualise (and later quantify) the local grain boundary misorientations? I am working with serial sectioning EBSD data with relatively large grains with a large but gradual lattice rotation throughout them, see below.

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If we were to do this on the voxel grid we would have to take into account all 6 faces of each voxel which means in theory there could be 6 misorientations for each voxel. We would also need to decide what to report the value as: Axis-Angle or just the angle or something else.

We may also be able to "get there from here" by using the calculate face-feature misorientations if each triangle had the original orientations from each grain association with it. So a 2xEuler on each triangle. Then we have to be sure how to map each Euler back to the original feature? And if we are considering ordering of the 2 orientations when something like the Triangle Winding filter changes the ordering then that messes up the orientations.

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