Merge branch 'feature/FieldConvertHomogeneousPlane' into 'master'
Feature/field convert homogeneous plane This MR creates a module to FieldConvert that extracts one of the planes of a 3DH1D expansion (with the option of getting it in wavespace). This way we can easily obtain slices along the z-direction. The meanmode module is also modified to use this new module, avoiding duplicate code. See merge request !542
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