Customization of GPS drawing options

[Bjoeni]

Followup of #20600 (and #13484, #20601, #21810, #21928)

GPS drawing options are currently quite limited and hardcoded. They should be customizable. This could be done a couple of different ways:

• Making currently hardcoded colors customizable as NamedColorProperties
• Allowing plugins to easily extend the existing functionality
• Implementing MapCSS for GPX layers?
• Implementing something else allowing the user to customize track colors for certain values

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Replying to stoecker:

I wonder if GPX layers should support MapCSS as well, so they can be styled directly instead of implementing all variants in JOSM core.

[taylor.smock]

• Implementing MapCSS for GPX layers?

This should be fairly easy to do -- we just need to have GpxData implement OsmData, and then we can essentially reuse the draw code in OsmDataLayer (MapRendererFactor.getInstance.createActiveRenderer(...)).

Honestly, the sticking point might be figuring out how to implement INode, IWay, and IRelation for GPX datasets. Especially since they are (technically) for OSM nodes/ways/relations.

Possible mapping:
INode -> WayPoint
IWay -> IGpxTrackSegment
IRelation -> IGpxTrack/IGpxRoute -- this will probably need a "parent", i.e. IGpxTrack extends IGpxRelation and IGpxRoute extends IGpxRelation.