Add @font-face rules to load TrueType and OpenType test fonts.

[fred-wang]

This commit removes the support/FontsToInstall directory and moves the
TrueType and OpenType test fonts directly into the support/ directory.
It attaches a support/test-fonts.css stylesheet to test pages so that
these test fonts are loaded via @font-face rules. Finally, the
instructions to install test fonts, the CSS rule for the installation
note as well as the "flags" meta tags are removed.

See discussions in issue #8440 ; note that these changes have essentially be done automatically using sed but be sure to check the following files:

 css/WOFF2/available-001.xht                          |   2 --
 .../{FontsToInstall => }/SFNT-CFF-Fallback.otf       | Bin
 .../{FontsToInstall => }/SFNT-CFF-Reference.otf      | Bin
 .../{FontsToInstall => }/SFNT-TTF-Fallback.ttf       | Bin
 .../{FontsToInstall => }/SFNT-TTF-Reference.ttf      | Bin
 css/WOFF2/support/available-001a.xht                 |   2 +-
 css/WOFF2/support/available-001b.xht                 |   2 +-
 css/WOFF2/support/index.css                          |  11 -----------
 css/WOFF2/support/test-fonts.css                     |  19 +++++++++++++++++++
 css/WOFF2/testcaseindex.xht                          |   1 -

See also issue #8482 for the available test.

[fred-wang]

cc'ing @litherum @gsnedders @jfkthame

[w3c-bots]

Build PASSED

Started: 2017-11-29 12:50:58
Finished: 2017-11-29 13:14:36

Failing Jobs

• MicrosoftEdge:14.14393

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[gsnedders]

Bah, none of these actually have <link rel=match href=foo-ref.xht>, I'll fix that in a new commit in a second.

[gsnedders]

OK, after those extra changes this LGTM.

[fred-wang]

@khaledhosny, @svgeesus, @rsheeter Can one of you please review this PR?

[gsnedders]

reviewers: ping!

[svgeesus]

Yes, this looks correct.

[fred-wang]

@gsnedders @svgeesus Thanks for your help on this!