wip, shape and geometry refactoring

src/mol-geo/geometry/base.ts

src/mol-geo/geometry/geometry.ts

src/mol-model/shape/shape.ts

src/mol-repr/representation.ts

src/mol-repr/shape/representation.ts

src/mol-repr/structure/complex-visual.ts

src/mol-repr/structure/units-representation.ts

src/mol-repr/structure/units-visual.ts

src/mol-repr/visual.ts

src/tests/browser/render-mesh.ts

src/tests/browser/render-shape.ts

webpack.config.js