Add support for other geometry classes known by WKT

[navibyte]

https://en.wikipedia.org/wiki/Well-known_text_representation_of_geometry

Now (at least some level of) support for:

• Point, MultiPoint
• LineString, MultiLineString
• Polygon, MultiPolygon
• GeometryCollection

However NO support for these, and not yet even planned any, is there need?

• Triangle
• PolyhedralSurface
• TIN (Triangulated irregular network)

Well-known binary (WKB) seems to have even more, but maybe most of these are totally out of focus for the geocore library...

• CircularString
• CompoundCurve
• CurvePolygon
• MultiCurve
• MultiSurface
• Curve
• Surface
• Circle
• GeodesicString
• EllipticalCurve
• NurbsCurve
• Clothoid
• SpiralCurve
• CompoundSurface
• BrepSolid
• AffinePlacement

[navispatial]

Better first implement #226 for simple geometries (target on geobase 2.0.0) and then extend support for other geometries too. This issue quite large however, maybe should be splitted (at least those geometries supported by JSON-FG, see #53).