Adds geom_match to point registration (#435)

* geom matcher added

* forgot the most important part

* important comment update

* fixed tests, added kwargs

* updated test

* things and stuff

* added geom_match to subpixel_register_point

* clip_roi -> roi.Roi

* changes as per comments

* check both x and y

* more changes from comments

* getattr

* typo