* CORDA-2672: Tidy up CorDapp deployments in samples.
* CORDA-2672: Refactor Attachment Demo.
* Remove Bank of Corda from Trader Demo.
* Configure SLF4J simple loggers, fix comments and documentation.
This includes all of the cash selection logic, JSON support using jackson and a bunch of utilities which are not relevant to contract verification. The exception to this are Interpolator which has been moved to the IRS demo, and PhysicalLocationStructures.kt which is now in explorer.
* Removed `restart node successfully with suspended flow` as it duplicates `TraderDemoTest#Test restart node during flow works properly`
* Removed the need for a notary
