Support for colorstop fill and stroke flags in segmented arc

[AmoebeLabs]

The Problem To Be Solved

The fill and stroke flags in the colorstops/colorlist are not yet supported by the segmented arc: the segarc always uses the color to fill a segment.

It would be nice if these colorstop flags are supported, as it makes the segarc consistent with other tools that do support these flags.

Note: Segemented arc was already implemented before these colorstop flags where introduced.

(Optional): Suggested Solution

Since issue #48 is created/updated, there are two - non breaking - implementations:

• support the fill/stroke flags for the default colorstop/list
• support later on the extended colorstopex/listex to get full styling and dark/light theme support Implement these flags, or even better, implement the new / changed colorstop idea where more styling can be done for each stop (see: #48).