Exported functions re-written to use {affiner} features:

* `AA_to_R()`
* `R_to_AA()`

Internal functions re-written to use {affiner} features:

* `arccos()`
* `at_ps_grob()`
* `pp_cfg()$get_grob_transformation()`

Now superfluous (internal) functions removed:

* `at_get_angle()`
* `at_height()`
* `at_is_flipped()`
* `at_label_face_coords()`
* `at_origin()`
* `at_rotate()`
* `at_shear_sx()`
* `at_trans()`
* `at_translate_to_origin()`
* `at_viewport()`
* `at_vp_info()`
* `at_width()`
* `at_x()`
* `at_y()`
* `cross_matrix()`
* `ppn()`
* `pnp()`
* `npp()`
* `shift_idx()`
* `trace()`
* `transformationGrob()`

progress on #326

`Point2D` now confined to `R/utils-geometry.R`

Internal functions re-written to use {affiner} features:

* `add_bounding_box()`
* `basicPyramidSide()`
* `basicPyramidTop()`
* `d4TopGrob()`
* `d4t_xyz()`
* `d10TopGrob()`
* `d12TopGrob()`
* `d20TopGrob()`
* `get_shapes()`
* `halmaMatGrobFn()`
* `ps_xyz()`
* `pt_xyz()`
* `save_2s_obj()`
* `save_peg_doll_obj()`
* several `Token2S` methods
* `visible_die_faces()`

New helper functions written:

* `npc_to_in()`

progress on #326

Internal functions re-written to use {affiner} features:

* `aabb_piece()`
* `Polygon$op_edge_order()`

New helper functions written:

* `degrees()`
* `as_coord2d.point2d()` and `as_coord3d.point3d()`

Now superfluous (internal) functions removed:

* `Point2D$npc_to_in()`
* `Point2D$translate_polar()`

progress on #326

Internal functions re-written to use {affiner} features:

* `basicDieEdge()`
* `basicEllipsoid()`
* `basicPyramidSide()`
* `d4TopGrob()`
* `d8TopGrob()`
* `d10TopGrob()`
* `d12TopGrob()`
* `d20TopGrob()`
* `generalTokenGrob()`

* `d4_xyz()`
* `d4t_xyz()`
* `d8_xyz()`
* `d8t_xyz()`
* `d10_xyz()`
* `d12_xyz()`
* `d20_xyz()`
* `die_xyz()`
* `ellipse_xyz()`
* `kite_xyz_missing_left()`
* `kite_xyz_missing_right()`
* `ps_xyz()`
* `pt_xyz()`

* `d4t_groobcoords_xyl()`
* `die_grobcoords_xyl()`
* `ps_grobcoords_xyl()`
* `pt_grobcoords_xyl()`

* `xy_vp_convex()`
* `xy_vp_kite()`
* `xy_vp_ps()`

* `FlatEdge$op_grob()`
* `Edge$visible_side()`
* `RingEdge$op_grob_nonperpendicular()`
* `RingEdge$op_grob_perpendicular()`
* `CurvedEdge$op_grob_nonperpendicular()`
* `CurvedEdge$op_grob_perpendicular()`

* `Token2S$initialize()`
* `Token2S$op_edge_order()`
* `Token2S$op_xy_vp()`
* `Token2S$visible_side()`

* `get_die_faces()`
* `visible_die_faces()`

* `CompositePiece()$transform_df()`
* `translate_df()`

* `save_2s_obj()`
* `save_ellipsoid_obj()`
* `save_peg_doll_obj()`

New helper functions written:

* `radius()`

Now superfluous (internal) functions removed:

* `Point2D$c()`
* `Point3D$c()`
* `Point2D$width()`
* `Point3D$width()`
* `Point3D$op_project()`
* `as.data.frame.point2d`
* `as.data.frame.point3d`
* `as.matrix.point2d`
* `as.matrix.point3d`

progress on #326

Internal functions re-written to use {affiner} features:

* `LineSegment$face_matrix()`

Now superfluous (internal) functions removed:

* `Point3D`
* `*.point3d()`

progress on #326

Internal functions re-written to use {affiner} features:

* `CurvedEdge$op_grob_perpendicular()`
* `RingEdge$op_grob_perpendicular()`
* `Circle$initialize()` and `Circle$project()`
* `Polygon$initialize()`, `Polygon$project()`, `Polygon$op_edge_order()`, `Polygon$op_edges()`
* `LineSegment$mid_point`, `LineSegment$orthogonal`
* `do_convex_polygons_overlap()`, `does_convex_polygon_overlap_circle`, `do_shapes_overlap()`

Now superfluous (internal) functions removed:

* `Point2D` and `Vector`
* `*.point2d()` and `*.geometry_vector`

progress on #326

Internal functions re-written to use {affiner} features:

* `Token2S$op_edge_order()`
* `Token2S$visible_side()`
* `Edge$visible_side()`
* `visible_die_faces()`

Now superfluous (internal) functions removed:

* `Line`
* `LineSegment$face_matrix()`

progress on #326

* To match upstream change in `{affiner}`