Closing Various WR Issues for which only WR Disposition Actions Remain

For the sanity of the editors and other observers, I am closing issues that
await only some WR disposition processing action, and am labeling them with
WR-for-disposition-action to make them easy to track.

You can easily access these issues via the following link

https://github.com/w3c/ttml2/issues?utf8=%E2%9C%93&q=is%3Aissue+label%3Awr-for-disposition-action