Add Tile Maps to visualize alignment errors

[arentkievits]

Plot stacks is now used to show the result of stitching or alignment. For point match visualization this is great because it shows any problematic tile pairs by plotting the # of point matches and also the image data, giving some insight in why the point match extraction works (or fails). E.g. because the tile pair contains empty resin which does not have any features.

Tile Maps are great because they can be quickly loaded and it is easy to spot tiles that are out of place. Therefore, integrate them in the workflow