[css-gcpm-3] fix help links in tests to point to TR rather than ED per plinss feedback
[css-gcpm] add ten tests for footnotes and xrefs
updated css-text-3 and css-transforms-1 spec links to match the new shortname that's been updated in shepherd
merging
removed unnecessary help and assert metadata
fixed css-flexbox, css-break, and css-transforms spec links in regions suite
fixed spec links in css-shapes suite
fixed spec links in css-masking suite
removed duplicate spec link
fixed spec links & ref links in css-writing-modes suite + corrected ref file names, removed unnecessary data from ref files
fixed one more spec link
fixed spec links in css-fonts, css-grid, and css-backgrounds suites
fixed spec links in multicol and namespaces suites
fixed spec links for filters + some misc others
merge