renamed Viewer to Canvas3D, Context to WebGLContext, moved themes to mol-theme

src/apps/canvas/app.ts

src/apps/canvas/assembly-symmetry.ts

src/apps/canvas/component/representation.tsx

src/apps/canvas/component/viewport.tsx

src/apps/canvas/structure-view.ts

src/apps/canvas/volume-view.ts

src/mol-app/component/color-theme.tsx

src/mol-canvas3d/canvas3d.ts

src/mol-geo/geometry/color-data.ts

src/mol-geo/geometry/geometry.ts

src/mol-geo/geometry/lines/lines.ts

src/mol-geo/geometry/points/points.ts

src/mol-geo/geometry/size-data.ts

src/mol-geo/representation/shape/index.ts

src/mol-geo/representation/structure/index.ts

...representation/structure/representation/ball-and-stick.ts

...o/representation/structure/representation/carbohydrate.ts

...ol-geo/representation/structure/representation/cartoon.ts

...esentation/structure/representation/distance-restraint.ts

...resentation/structure/representation/molecular-surface.ts