Writing Modes: update tcu+fullwidth tests

update style and spec URLs of the existing tests and references.
also add negative references so that tests will fail on UAs without support for
`writing-mode` and `text-combine-upright`
Writing Modes: move tcu+fullwidth tests to the correct directory
don't build test files in formats incompatile with test sutie
Add brief test for calc unit checking, inspired by https://bugzilla.mozilla.org/show_bug.cgi?id=1041994 .
Link to preferred spec shortname.
One line of the content can't wrap properly around the shape because it's too wide, when shape-margin is respected properly.
update w3ctestlib to fix missing reference files in build
update w3ctestlib
update w3ctestlib
Merge pull request #608 from zhorvath/master

One line of the content can't wrap properly around the shape
update w3ctestlib
update tcu-font requirement documents

make edits so that requirements appear in bulleted list.
also add more glyph images.

Bug: https://github.com/w3c/csswg-test/issues/571
Merge pull request #597 from myakura/myakura/moving_from_wipdir

LGTM Writing Modes: update tcu+fullwidth tests