Remove AnnotationCalloutCustom masking

Breaking change for those using AnnotationCalloutCustom or SubjectCustom

Previously there was logic that would create a custom mask based on the custom annotation and the custom path. This was buggy and has now been removed. If you still want to center your custom annotation and have some radius around it so the connector doesn't intersect, you can pass a radius: 50 for example to create a circular border away from the center of the annotation's connector.