[css-writing-modes] Require hwid/twid/qwid for OT implementations of TCY compression when they are available for all characters in the composition

[css-text] More details on expansion opportunities

[css-text] More cleanup up of possible justification algorithms section. Add sentence imposing requirement for correctly handling complex scripts regardless of justification.

[css-shapes] fix generated file

[css-exclusions] grammar fix

[css-shapes] change closing polygon to MUST

[css3-fonts] fixup Bert's edits and switch back to ED

[css-text] More tweaking of the justification section. Add section headings. Rearrange paragraphs. Etc.

[css-shapes] Fixed basic shape grammar to use comma separators

[css-counter-styles] Preprocessor fixes.

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