[ttml2] Make inline region semantics set values on current region

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[ttml2] Make inline region semantics set values on current region

r12a via GitHub
nigelmegitt has just created a new issue for
https://github.com/w3c/ttml2:

== Make inline region semantics set values on current region ==
The current semantic when inline style attributes applicable to
regions are used in content elements is to create a new implied inline
 region.

### Options

1. Keep existing semantic where new anonymous regions are created.
2. Modify the semantic such that when region style attributes are
encountered on content elements they are used to modify the current
region for that content element while the element is active.

Option 2 would be syntactic shorthand for a `<set>` element on a
region that modifies the region's `tts:origin`, `tts:extent` or
`tts:position`.

### History
I raised this discussion with the thread beginning at
https://lists.w3.org/Archives/Public/public-tt/2015Oct/0068.html 
however it was not concluded.

This issue satisfies tracker [action
472](https://www.w3.org/AudioVideo/TT/tracker/actions/472).

Please view or discuss this issue at
https://github.com/w3c/ttml2/issues/168 using your GitHub account