Merge gst-depth-meta and gst-depth-meta-rs

We never require gst-depth-meta in any C project. Therefor I've decided to merge gst-depth-meta and gst-depth-meta-rs. This is to simplify build processes and make it easier for us to use nix in the future

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• 6f2f1ce4 - Merge gst-depth-meta and gst-depth-meta-rs

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added 1 commit

• d0015c0e - Merge gst-depth-meta and gst-depth-meta-rs

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added 3 commits

• d0015c0e...78d3af0f - 2 commits from branch master
• 48a6973e - Merge gst-depth-meta and gst-depth-meta-rs

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merged