* Change versioning on master to 4.1.x development
* Remove SlateV3, V3 References from command-line code
* continue to remove pre HF3 functionality, remove participant_id from slate, remove is_compact, derive slate state based on slate state field
* slate no longer needs explicit compact step
* version/build coinbase doctest cleanup
* don't attempt to store transaction during tx lock if it doesn't exist
* repair incorrectly removed logic
* last test fixes (hopefully)
* debugging tor sends
* use fixed yeast version of hyper-socks2
* send command working according to slatepack
* changes to handling proof address
* modifications of recieve command to work with slatepack and to attempt to return to sender via TOR
* finalize command tested
* attempting to add invoice processing
* fixes to tests, propagation of test mode where needed
* modify return values of api functions that can send as sync
* cleanup, testing and post_tx function
* revert changes to API, many test fixes
* deprecate http on the command-line warning
* change all user-facing instances of addresses to a SlatepackAddress
* finish renaming get_slatepack_address + documentation
* get_slatepack_secret_key OwnerRPC implementation and test
* add owner api functions
* OwnerRPC functions + doctests
* add explicit slatepack API tests to exercise encryption
* update api function names to better reflect RFC
* addition of SlatepackAddress type
* complete conversion of ed25519 keys to x25519 and isolate conversion within libwallet
* refactor packing/unpacking of slates logic into libwallet and out of slate adapters
* println
* recreate PR from #400
* first tests with slate encryption
* simplify slatepack model to contain encryption header in payload, and add de/ser tests
* update tests and confirm slatepack encryption working
* remove recipient list, add version check warning
