move test package class DiskWithAHoleLevelSetFunction in to MarchingTriangleContourBuilder
add getEdgesNeighbours() and getNodesNeighbours() to TriangleContourCell
let TriangleContourCell store pass by contour lines
add status getter in TriangleContourCell
add TrackContourBuilder and its Specificiation
add a weak test of TrackContourBuilder
Add TrackContourBuilder selection to TriangleContourBuilderDemo