[w3c/clipboard-apis] Support for reading custom MIME types from the clipboard (#46)

As mentioned in the comments here: https://github.com/w3c/clipboard-apis/issues/9 there are separate security concerns with _reading_ and _writing_ data for custom MIME types. 

I'm reopening the discussion for the _reading_ part. 

It sounds like unmediated access to the clipboardData in all available formats may pose a privacy concern, so it may be best to require some sort of consent from the user (as the previous thread suggested). 

I don't feel confident enough to make a concrete proposal, but wanted to reiterate the realm of possibility enabled by such a feature in providing interop between web and the OS.

## Current browser status & related issues

* Safari provides unmediated access to the clipboardData in all formats
* Chrome team [is skeptical](https://bugs.chromium.org/p/chromium/issues/detail?id=487266#c5) in enabling custom MIME types
* Firefox team [decided on WONTFIX](https://bugzilla.mozilla.org/show_bug.cgi?id=1389919) due to concerns raised on the Chromium thread

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