[FEATURE] Support arbitrary vertex attributes about tmf HOT 6 OPEN

Support for custom float attributes added in a164eb2.

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Supporting arbitrary vertex attributes would not be hard, but those attributes would receive little to no size reduction due to the compression algorithm requiring a lot of insight into data stored. Since knowing what is stored accounts for most of the savings (normals being unit vectors, uvs being in the range 0.0-1.0), a lot of savings comes from code which differs for each attribute. So custom vertex attributes would be mostly compression-less. The compression-less variant could be added in a couple of work hours.

A much better approach would be to have dedicated format segments for those attributes. Knowing their properties could allow for them to be compressed. Would you mind opening issues for each kind of data your use case requires?

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d9a5be3 adds some groundwork for supporting custom mesh data. API will be a bit more involved than the one proposed (many kinds of CustomData), but all custom data will be compressed.

Planned supported data kinds:

1. CustomIndex
2. CustomFloat
3. CustomVetor2
4. CustomVector3
5. CustomVector4
6. CustomColor(Vector4 with components of between 0.0 and 1.0)
7. CustomUnit2(Vector2 of length 1)
8. CustomUnit3(Vector3 of length 1)

This data may reuse some of the compression architecture and would be compressed to comparable levels as other mesh data.
Each custom segment should have a unique name of between 1 and 255 characters.

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Awesome. This is way beyond any expectation. It's definitively not a deal breaker to not have access to extra attributes, but it's very handy. I'll open a feature request for tangents.

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d38894d adds support for saving/reading custom indices with a name of up to 255 characters. All the groundwork for saving other data types is there, only thing left to implement is the glue code to decode the data in other types of custom segments.

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Support for RGBA colors added in 6f7598a.

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