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Done. The old API for glyph color animation was provided the following
parameters inside a vector:
- Hue
- Saturation
- Value
- Boolean = false for fill, true for border
- an optional Foat for translucency.

The new API takes the following parameters, still in a vector:
- Fill hue
- Fill saturation
- Fill value
- Border hue
- Border saturation
- Border value
- an optional Float for translucency.

Since all these are interpreted as offsets, just put a zero value for the
parameters that should not change.