Added mesh export options to preserve and remap UV set names

[jonjondev]

Currently, the ADSK plugin always authors UV sets as st, st1, st2, etc. While AL's pipeline ultimately assumes that map1 should be renamed to st on export and additional named sets should retain their naming as specified in Maya.

A new export option, -preserveUVSetNames (-puv), has been added to allow for the preservation of set names:

def Mesh "my_geo"
{
    texCoord2f[] primvars:rigging_utility = [...] (
        interpolation = "faceVarying"
    )
    int[] primvars:rigging_utility:indices = [...]

    texCoord2f[] primvars:map1 = [...] (
        interpolation = "faceVarying"
    )
    int[] primvars:map1:indices = [...]
}

A second export option, -remapUVSetsTo (-ruv), has been added on top of this to provide a generalised solution to our specific use-case, where the options remapUVSetsTo=[[map1, st], [rigging_utility, my_uv_set]] would produce:

def Mesh "my_geo"
{
    texCoord2f[] primvars:my_uv_set = [...] (
        interpolation = "faceVarying"
    )
    int[] primvars:my_uv_set:indices = [...]

    texCoord2f[] primvars:st = [...] (
        interpolation = "faceVarying"
    )
    int[] primvars:st:indices = [...]
}

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[jonjondev]

Hey @seando-adsk, looks like preflight is passing. Any chance this can get a review?

[seando-adsk]

@J-Mo63 Sorry about the delay. I've assigned a reviewer now.

[vlasovi]

I think this comment may be improved:

1. In the code, -remapUVSetsTo takes priority over -preserveUVSetNames. We need to add a comment here clarifying this behaviour.
2. The comment here says: "map1" will always be renamed to "st". I'm not sure I saw this behaviour in the code. Is this true?

[jonjondev]

Yes sorry that's a bit outdated. I'll go ahead and fix that right up.

[vlasovi]

This is a really nice feature. Thanks, @J-Mo63.
I request only a couple minor improvements. Please see in the comments.

[jonjondev]

Hey @vlasovi, your feedback has been actioned. Let me know if it's all good to go.

[vlasovi]

Looks good