COMPAS Plotter 1.0.0

Added

• Initial COMPAS 2.x port of compas_plotters (the package that shipped inside COMPAS up to 1.17).
• Plotter class for 2D matplotlib visualisation, including dynamic plotting
  (Plotter.on) with optional GIF recording.
• "Plotter" visualisation context built on compas.scene.
• Scene objects for Point, Vector, Line, Polyline, Polygon, Circle,
  Ellipse and Frame.
• Scene objects for the Mesh and Graph data structures, with vertex/edge/face
  and node/edge labels.
• PlotterScene, a compas.scene.Scene subclass bound to the "Plotter"
  context. Every Plotter now owns one, giving a hierarchical scene tree
  (parent/child transforms), serialization, and API symmetry with the Rhino,
  Blender and Viewer backends.
• Scene object for Box, drawn as the exact XY projection of its six faces.
• Shared ShapeObject drawing Sphere, Cylinder, Cone, Capsule, Torus
  and Polyhedron as tessellated XY projections, with u/v resolution control.

Changed

• GraphObject.node_xyz and MeshObject.vertex_xyz return fresh view
  coordinates on every access instead of a mapping cached at first access, so
  a redraw in a Plotter.on animation loop picks up
  changes to the coordinates of the underlying datastructure.

Removed