[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
fixed namespaces links again
update namespaces spec links
merging
fix file extensions

--HG--
rename : css-gcpm-3/leader-001.xht => css-gcpm-3/leader-001.html
rename : css-gcpm-3/leader-002.xht => css-gcpm-3/leader-002.html
rename : css-gcpm-3/leader-003.xht => css-gcpm-3/leader-003.html
rename : css-gcpm-3/string-set-001.xht => css-gcpm-3/string-set-001.html
rename : css-gcpm-3/string-set-002.xht => css-gcpm-3/string-set-002.html
rename : css-gcpm-3/string-set-003.xht => css-gcpm-3/string-set-003.html
rename : css-gcpm-3/string-set-004.xht => css-gcpm-3/string-set-004.html
rename : css-gcpm-3/string-set-005.xht => css-gcpm-3/string-set-005.html
rename : css-gcpm-3/string-set-006.xht => css-gcpm-3/string-set-006.html
rename : css-gcpm-3/string-set-007.xht => css-gcpm-3/string-set-007.html
rename : css-gcpm-3/string-set-008.xht => css-gcpm-3/string-set-008.html
rename : css-gcpm-3/string-set-009.xht => css-gcpm-3/string-set-009.html
rename : css-gcpm-3/string-set-010.xht => css-gcpm-3/string-set-010.html
rename : css-gcpm-3/string-set-011.xht => css-gcpm-3/string-set-011.html
rename : css-gcpm-3/string-set-012.xht => css-gcpm-3/string-set-012.html
rename : css-gcpm-3/using-strings-001.xht => css-gcpm-3/using-strings-001.html
rename : css-gcpm-3/using-strings-002.xht => css-gcpm-3/using-strings-002.html
rename : css-gcpm-3/using-strings-003.xht => css-gcpm-3/using-strings-003.html
rename : css-gcpm-3/using-strings-004.xht => css-gcpm-3/using-strings-004.html
rename : css-gcpm-3/using-strings-005.xht => css-gcpm-3/using-strings-005.html
extra : rebase_source : 09e9e805937ee18c627feab670f08dc11cbdeec9
fixed css-gcpm spec links