Eyevinn / mp4ff / 30165884676

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feat(mp4): parse and preserve the tkhd transformation matrix

DecodeTkhdSR skipped the matrix and EncodeSW always wrote the unity
matrix, so rotation set by phone cameras was lost on a decode/encode
round trip. Parse it into TkhdBox.Matrix and encode it back. A
zero-value Matrix still encodes as unity for backwards compatibility.

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