[w3c/clipboard-apis] supported type should include MathML types (#141)

This issues proposes that the [MathML media-types](https://www.w3.org/TR/MathML/appendixb.html#media-types-mathml) also be included as mandatory media-types for  [paste](https://w3c.github.io/clipboard-apis/index.html#reading-from-clipboard) and [copy](https://w3c.github.io/clipboard-apis/index.html#writing-to-clipboard) events:

- [`application/mathml+xml`](https://www.w3.org/TR/MathML/appendixb.html#media-types-mathml)
- [`application/mathml-presentation+xml`](https://www.w3.org/TR/MathML/appendixb.html#media-types-mathml-p)
- [`application/mathml-content+xml`](https://www.w3.org/TR/MathML/appendixb.html#media-types-mathml-c)

Indeed the [use case](https://w3c.github.io/clipboard-apis/index.html#change-default-clipboard-ops) includes mathematical information as one of the targets. But as of today, only `application/xml` would be allowed while this type is much too generic. A few applications exposed the platform specific "clipboard flavors" which are also specified in the media-types declarations.

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