Re: [w3c/clipboard-apis] Add mandatory and optional data types list. (#155)

@annevk 
Chromium, Safari & FF have support for types that are not in the list, but they are exposed via DataTransfer & async clipboard APIs. 
e.g. Safari has support for `text/uri-list`, Chrome has support for `image/svg+xml` etc.
I think it's fine to add the mime types that are supported in all browsers in the MUST support list, but we should at least mention the types that are supported by a particular browser so the web authors are aware of it. This type may not be available in other browsers so I added those "optional" types to the MAY support list. It also leaves room for future improvements to support more standard well known types defined by the OS (this is different than custom formats support).

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