Set paragraphs into lines: bidi, script runs, shaping, line breaking, visual order

text/layout.c puts the checked parts together: a paragraph's levels,
scripts resolved for Common and Inherited characters, break
opportunities, one shaping to measure, lines broken at the last
opportunity that fits (trailing spaces hang, and a line that shapes
wider than measured backs off), then per line L1, runs of one level and
one script shaped again, the runs in L2's order and their glyphs placed.
test-layout checks 30,000 random mixed-script paragraphs: lines cover
the text, mandatory breaks end lines, lines fit when they can, and
glyphs come in the order UAX #9 gives the characters. vega-symbols
paragraph draws a layout through the symbol file's glyphs.

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