Add "Parametric Slant" axis

[davelab6]

In https://github.com/Microsoft/OpenTypeDesignVariationAxisTags/issues/37#issuecomment-402954540 @dberlow said,

we need to return the parametric angle axis to our framework, with the intuitive values we originally proposed

I don't remember a parametric angle axis proposal. If this can be fished out of the commit history, that would be great! But perhaps this needs to be rewritten from scratch? PSLN? :)

[dberlow]

The very first version had something called VANG. As I said I removed it when I thought slant would do it. I’ll get to it when I get back but it’s a pretty straightforward thing compared to the garbage they’ve made of a simple thing.

On Jul 9, 2018, at 9:13 PM, Dave Crossland notifications@github.com wrote:

In Microsoft/OpenTypeDesignVariationAxisTags#37 (comment) @dberlow said,

we need to return the parametric angle axis to our framework, with the intuitive values we originally proposed

I don't remember a parametric angle axis proposal. If this can be fished out of the commit history, that would be great! But perhaps this needs to be rewritten from scratch? PSLN? :)

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[davelab6]

@dberlow where is that very first version? Or will it be quicker for you to just reply with a new version here? :)

[dberlow]

There were various names that eventually evolved to variationsguide.typenetwork.com/#vrot ...This was proposed as a general solution to differ rotational variation to skewed variation that was thought to be typographic slant.

On Jan 27, 2020, at 2:53 PM, Dave Crossland notifications@github.com wrote:

 @dberlow where is that very first version? Or will it be quicker for you to just reply with a new version here? :)

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