Merge branch 'tests/tangle' into integration/value

dapps/valuetransfers/packages/branchmanager/branchmanager.go

dapps/valuetransfers/packages/branchmanager/objectstorage.go

dapps/valuetransfers/packages/consensus/fcob.go

dapps/valuetransfers/packages/tangle/attachment.go

dapps/valuetransfers/packages/tangle/attachment_test.go

dapps/valuetransfers/packages/tangle/consumer.go

dapps/valuetransfers/packages/tangle/debugger.go

dapps/valuetransfers/packages/tangle/events.go

dapps/valuetransfers/packages/tangle/imgs/concurrency.png

...ckages/tangle/imgs/reverse-transaction-solidification.png

...ckages/tangle/imgs/reverse-valueobject-solidification.png

dapps/valuetransfers/packages/tangle/missingoutput.go

dapps/valuetransfers/packages/tangle/missingpayload.go

dapps/valuetransfers/packages/tangle/objectstorage.go

dapps/valuetransfers/packages/tangle/output.go

dapps/valuetransfers/packages/tangle/output_test.go

dapps/valuetransfers/packages/tangle/payloadapprover.go

dapps/valuetransfers/packages/tangle/payloadmetadata.go

dapps/valuetransfers/packages/tangle/payloadmetadata_test.go

dapps/valuetransfers/packages/tangle/tangle.go