Make segintersector.isDone() default to false

[micycle1]

Give the SegmentIntersector interface's isDone() method a default value of false.

This way one can process all intersections cleanly with a lambda (rather than inner class that must implement both processIntersections() and isDone().

mci.process(segmentStringsB, (e0, segIndex0, e1, segIndex1) -> {
    sid.processIntersections(e0, segIndex0, e1, segIndex1);
    if (sid.hasIntersection()) {
    	// do
    }
});

[dr-jts]

Looks good. If this is done I'll merge.

[micycle1]

Done from me.