* Move JavaFX Models functions into Models so that there isn't an empty ModelsKt class generated
for Java interop.
* Move Models functions into their own file as pushing them into the Models class requires significant changes to the Explorer.
* Remove internal state of TransactionGraphSearch from being publicly visible.
* Add Dokka comments for TransactionGraphSearch.Query values.
* Move query into TransactionGraphSearch constructor as it should always be set except for test cases.
* Move TransactionGraphSearch into trader demo
* Remove unneeded identity registrations from tests, which sometimes cause duplicated entries in the database
* Add JvmName annotations to ObservableFold and ObservableUtilities
* Move createMapChange() into ReadOnlyBackedObservableMapBase as the only place it's used, to
improve Java interop.
* Clean up Generator by moving extension functions into the class/companion class.
* Add documentation to the actual functions rather than being only on the top level class.
* Add JvmName to Generators
* Move extension functions into the classes they're used in to try supressing generation of empty RPCClientProxyHandlerKt class.
* Add JvmName to ConcurrencyUtils
* Move Iterable<ServiceInfo>.containsType() into Simulation, as it's only useful when verifying
setup of a simulated case. Resolves ServiceInfoKt class being generated.
* Move FlowHandle.notUsed() into the one place it's actually called, so Kotlin stops creating a FlowHandleKt class.
* [CORDA-303]: Add some tests that stop and start a node and check state is persistent.
* [CORDA-303]: Updated change log and added Javadocs.
* [CORDA-303]: Cleaned up test.
* [CORDA-303]: Removed blank lines after class or function declarations.
* [CORDA-303]: Wrapped multiple invocations in `with` construct.
* All Contract Upgrade functionality performed within a corresponding flow.
Removed RPC API calls for contract upgrade authorisation / de-authorisation.
Added persistence using AppendOnlyPersistentMap.
* Changed to using a PersistentMap to ensure entries can be removed (was causing failing de-authorisation tests).
Fixed all warnings.
* Added mandatory @Suspendable annotations to flows.
* Do not instantiate object unless overridden.
* Updated changelog and CordaDocs.
* Persistence simplification: only store upgrade contract class name (not serialized object)
* Remove nullability from contract_class_name DB column.
