parse Ellipse extrusionDirection
210 220 230 is generic, maybe we should optimize the code.
This should use helpers.parsePoint(scanner) . You can see an example of it in use here: https://github.com/gdsestimating/dxf-parser/blob/a7aef87d70fa9664942beb581fbe791f1360bcf8/src/entities/dimension.ts#L33-L35

I know this, but there seem to be two ways of handling this 210 in this library, should we unify the code?
Any new code should really parse such coordinates into a point object. The 3 extrusionDirection properties were left over from an early iteration of the project and I didn't want to introduce a breaking change.