ENH: add volume_color_updown_dependency for volume bar coloring (closes #680)#702

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sanykiv:feature/volume-color-updown-dependancy

Commits on Jul 17, 2026

ENH: add volume_color_updown_dependancy kwarg (Open vs Close / Previous Close / Previous Volume)
sanykiv
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TST: add tests for volume_color_updown_dependancy (modes, normalization, vcdopcod back-compat)
sanykiv
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Commits on Jul 18, 2026

ENH: rename to volume_color_updown_dependency (spelling) + expose via plot() and make_mpf_style()
sanykiv
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