Upstream contributions to jfx.incubator.richtext

[koppor]

Gaps in the incubator RichTextArea that html-to-node currently works around (split from #2; details and workaround pointers there). Each landed OpenJFX feature deletes a workaround here:

1. Character-level link attribute with activation handling (currently: custom HREF attribute + getTextPosition on click)
2. Inline node/image embedding as first-class model feature (currently: addNodeSegment, view-only model only)
3. Baseline-shift / vertical-align character attribute (currently: sub/sup lose their shift, font-size only)
4. Numeric font weights (currently: CSL's font-weight: 100 collapses to normal/bold)
5. Styleable selection/caret colors on the control (e.g. -fx-selection-fill, -fx-caret-color) instead of Modena rules on skin-internal sub-nodes — see the analysis in Evaluate a RichTextArea-based renderer (JavaFX incubator) as alternative to FxRenderer #2
6. A lean read-only viewer mode without caret/edit overhead

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