Identical files: average.py and centroid.py in compas/geometry/_core

[tetov]

Describe the bug

Both files contains the same functions, only centroid.py is picked up by __init__.py.

    'midpoint_point_point',
    'midpoint_point_point_xy',
    'midpoint_line',
    'midpoint_line_xy',

    'centroid_points',
    'centroid_points_weighted',
    'centroid_points_xy',
    'centroid_polygon',
    'centroid_polygon_xy',
    'centroid_polygon_vertices',
    'centroid_polygon_vertices_xy',
    'centroid_polygon_edges',
    'centroid_polygon_edges_xy',
    'centroid_polyhedron',

Expected behavior

DRY