Get composites working about samsa HOT 4 CLOSED

All the above are now fixed in 47eb575, apart from static font output. Should not be much more work.

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Composites in Glyphs panel fixed in 933af87

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Composites in Glyphs panel fixed (again) in 8d01802. (Somehow they’d been disabled by being omitted from in instanceApplyVariations() in samsa-core.js)

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Fixed with new SamsaGlyph object and composite handling in ed207a6

Methods for SamsaGlyph:

.instantiate() – to make a glyph instance according to supplied tuple parameter

.decompose() – to decompose a composite glyph into a simple glyph, and taking account of offsets and transform, a much better recursive model than the previous one which was tied to SVG conversion (also respects tuple parameter if supplied)

.svgPath() – make an SVG path "d" string for this glyph (requires simple glyph, such as generated by .decompose()

So glyph decomposition has been decoupled from SVG generation, SVG generation is now limited to simple glyphs. The old function glyphApplyVariations() is replaced with SamsaGlyph.instantiate() and SamsaGlyph.decompose() throughout.

samsa-gui.html updated to use the new SamsaGlyph object and its methods. All code that generated SVGs for glyphs is simplified, since we simply call .decompose().svgPath().

The update fixes various problems with deeply nested composite glyphs including bad component positioning in the Glyphs panel and the main window. Also fixed is SVG animation for composites.

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