* Hash to signature constraints migration #1
* After rebase from Attachments Classloader commit.
* Simplified implementation without CZ whitelisting and relaxing the no-overlap rule slightly.
* Further simplification.
* Detailed implementation.
* Use fully loaded Cash contract jar for hash to signature constraints migration test.
Additional debug logging.
* Minor cleanup.
* Address PR review feedback.
* Minor fix.
* Fixes following rebase from master.
* Implemented `calculateEntriesHashes` to improve classloader validation performance.
* Address minor PR review comments.
* Added integration tests and some minor fixes.
* Minor fixes following rebase from master.
* Updates and fixes following integration testing.
* Added changelog entry.
* Fix broken unit tests.
* Fix compilation errors in DriverDSL tests after rebase from master.
* Minor fix to test cordapp jar signing using explicit keystore.
* Run hash-to-signature constraints integration test out of process using a non-validating notary.
* Address PR review feedback: contract version from database + other minor changes.
* Address final PR review feedback: remove signed attachment field from attachmentWithContext
* Resolve conflicts following rebase from master.
* Fix failing junit test.
* Fix Kryo serialization error (forgot to write new `version` identifier field)
* Removed redundant query carried over from previous commit.
* Added documentation.
* Fix test case where explicit Hash Constraint input and Signature Constraint output explicitly configured.
* Addressing PR review comments from SA.
* AttachmentQueryCriteria API: added wither methods and Java Unit tests.
* Fixed compilation error caused by Unit tests being in wrong module.
* Added @CordaInternal to canBeTransitionedFrom function.
* Minimized AttachmentClassloader overlap duplicates checking.
* Moved JarSignatureTestUtils and ContractJarTestUtils to internal pending clean-up and documentation before public release.
* Minor fix following rebase from master.
* Removed redundant checkNotNull(networkParameters) checks now that these are always passed into the main (non-deprecated) constructor.
* Remove capitalization.
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