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Resolve "Extended metadata issues"

norvell requested to merge 379-extended-metadata-issues into main

Related to #379 (closed)

This is a set of fixes resolving #379 (closed). The changes are bit exact on the self_test. The main part of the fixes are under the define FIX_379_EXT_METADATA but a refactoring/renaming relating to the metadata angles are put under a separate define FIX_379_ANGLE.

The fixes include resolving using extended metadata with rate switching, which currently does not work in main. A test case is planned to be added in a separate MR, covering both the extended metadata (#377 (closed)) and rate switching on top of this.

We have also found that there may be discontinuities when switching extended metadata on and off. We have a solution that applies the gain change using a smoother transition. However, since this change is not bit exact we will put this in a separate MR.

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