Moved common graph data structures to separate folder

src/common/graph/graph.ts

src/common/graph/graphelement.ts

src/common/graph/link.ts

src/common/graph/node.ts

src/common/graph/nodetype.ts

src/display/components/nodefilter/filtermenu.tsx

src/display/components/nodeinfo/neighbors.tsx

src/display/components/nodeinfo/nodeinfobar.tsx

src/display/components/searchbar.tsx

src/display/display.tsx

src/display/renderer.tsx

src/editor/components/nodedetails.tsx

src/editor/components/nodetypeentry.tsx

src/editor/components/nodetypeseditor.tsx

src/editor/editor.tsx

src/editor/graph.ts