[w3c/FileAPI] Update stream creation and manipulation (#166)

This also ensures tasks are queued when manipulating stream objects.

Closes #165.


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  https://github.com/w3c/FileAPI/pull/166

-- Commit Summary --

  * Update stream creation and manipulation

-- File Changes --

    M index.bs (28)

-- Patch Links --

https://github.com/w3c/FileAPI/pull/166.patch
https://github.com/w3c/FileAPI/pull/166.diff

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