Merge pull request #819 from iotaledger/refactor/message_structure

dapps/valuetransfers/packages/payload/payload_test.go

packages/tangle/message.go

packages/tangle/message_test.go

packages/tangle/messagefactory.go

packages/tangle/messagefactory_test.go

packages/tangle/payload/payload.go

packages/tangle/payload_test.go

packages/tangle/tangle.go

packages/tangle/tangle_test.go

packages/tangle/test_utils.go

packages/tangle/tipselector.go

packages/tangle/tipselector_test.go

plugins/dashboard/explorer_routes.go

...rontend/src/app/components/ExplorerMessageQueryResult.tsx

plugins/dashboard/frontend/src/app/components/Visualizer.tsx

plugins/dashboard/frontend/src/app/stores/ExplorerStore.tsx

plugins/dashboard/frontend/src/app/stores/VisualizerStore.ts

plugins/dashboard/pkged.go

plugins/dashboard/visualizer.go

plugins/faucet/component_test.go