Add function to perform cropping in either sequence/collection axes

[cmeyer]

Evaluate whether this function (below) would work (with cleanup) or whether something new is needed.

https://github.com/nion-software/experimental/blob/c82a086a78e85a6add21ccf120386ebf67e281e9/nionswift_plugin/nion_experimental_tools/MultiDimensionalProcessing.py#L43

See also function_sequence_trim.

Needs tests and must work efficiently with h5py backed arrays.

NOTE: this issue is for the low level function only, not any UI

[cmeyer]

See comments on this issue too:

• Crop computation gives inconsistent results for specific data/crop shape combinations nionswift#814