mol-canvas3d: refactored Camera

src/apps/canvas/component/viewport.tsx

src/mol-canvas3d/camera.ts

src/mol-canvas3d/camera/base.ts

src/mol-canvas3d/camera/combined.ts

src/mol-canvas3d/camera/orthographic.ts

src/mol-canvas3d/camera/perspective.ts

src/mol-canvas3d/canvas3d.ts

src/mol-canvas3d/controls/trackball.ts

src/mol-gl/_spec/renderer.spec.ts

src/mol-gl/renderer.ts

src/mol-plugin/state.ts