adding menus

js/menus/AnimationMenuView.js

js/menus/AssemblerMenuView.js

js/menus/ImportMenuView.js

js/menus/LatticeMenuView.js

js/menus/MaterialMenuView.js

js/menus/MenuWrapperView.js

js/menus/OptimizationMenuView.js

js/menus/PartMenuView.js

js/menus/PhysicsMenuView.js

js/menus/SketchMenuView.js

js/models/Lattice.js

main.html