[cssom] Add a sample test for cssom for testwtf tokyo

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extra : rebase_source : c383cc4853938d6d38a59fdf4d905a1f2f4d1c78
[cssom] Remove <base> element I used for local testing
refactored tests a bit more

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rename : contributors/adobe/incoming/css3-regions/transforms/reference/regions-transforms-004-alt-ref.html => contributors/adobe/incoming/css3-regions/transforms/reference/regions-transforms-012-alt-ref.html
rename : contributors/adobe/incoming/css3-regions/transforms/reference/regions-transforms-004-ref.html => contributors/adobe/incoming/css3-regions/transforms/reference/regions-transforms-012-ref.html
rename : contributors/adobe/incoming/css3-regions/transforms/regions-transforms-012.html => contributors/adobe/incoming/css3-regions/transforms/regions-transforms-004.html
rename : contributors/adobe/incoming/css3-regions/transforms/regions-transforms-004.html => contributors/adobe/incoming/css3-regions/transforms/regions-transforms-012.html
added spec links for Level 3 spec for Sec. 15.2 in the CSS2.1 spec - Font matching algorithm
added spec links for Level 3 spec for Sec. 15.3 in the CSS2.1 spec - the font-family property
added spec links for Level 3 spec for Sec. 15.4 in the CSS2.1 spec - the font-style  property
added spec links for Level 3 spec for Sec. 15.5 in the CSS2.1 spec - the font-variant  property
added spec links for Level 3 spec for Sec. 15.6 in the CSS2.1 spec - the font-weight  property
added spec links for Level 3 spec for Sec. 15.7 in the CSS2.1 spec - the font-size property
added spec links for Level 3 spec for Sec. 15.8 in the CSS2.1 spec - Shorthand font property: the font property
added a few more Level 3 spec links
removed links to descriptors that were tests actually for properties
added correct links for font-variant propdef in the level 3 spec
Sync Mozilla tests as of https://hg.mozilla.org/mozilla-central/rev/9ca690835a5e .