* Add prototype contract implementation

Lacks:
- Payment proofs (add early payment proofs)
- Tests
- Better structure

* Separate contract utilities

* Simplify the main setup/sign code flow

* Remove commented initial_sec_key assignment

* Simplify sign::compute function

* Add logic for "removal" of secret keys from the context

* Further simplify a bit sign and setup

* No need for mutable context when adding outputs

* Refactor the commented code (lol)

* Refactor a bit

* tmp

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Co-authored-by: oryhp <[email protected]>

* beginning to add and modify slate version 5

* completion of conversions from V5 to V4 Slate

* timestamp and memo fields

* upgrade/downgrade serialization of v5 slates

* add v5 binary slate versions + start of tests

* add bin slate ser/deser to tests

* ensure serialization of timestamp always excludes milliseconds

* start to update v5 tests, update v5 documentation

* add fn to generate populated internal slate for conversion testing

* add basic tests to convert all slate versions

… into contracts

* add types and beginnings of signature utils

* add proof serialization

* serialisation of proof data + signature operation

* add serialization type for invoice proof + separate bin wrapper version

* add witness data + serializion to invoice payment proof, insert verfication functions in place in order to begin verification testing

* tests and infrastructure in place for validation

* verification of promise sig

* added verification of promise signature, infrastructure up to the point where a signature must be subtracted

* attempting to figure out differences between recipient nonce that's getting stored and calculated recipient nonce

* implementation of witness verification function, retrieve relevant values and re-validate derived recipient partial signature

* move stored portion of invoice proof into core types for storage, need to rename invoice proof

* define/refine the stored portion of payment proofs type 2?

* Folding all proof data into tx log entry storage

* back to importing master

* remove cargo files from diffs

* remove a lot of extra debug output

* return proof witness as part of proof retrieval, define json serialization of invoice proof + witness fields

* finish adding verification steps to foreign API

* remove redundant promise sig field

* move lcation of sign/verify calls

* Replace Azure Pipelines with Github Actions (mimblewimble#688)

* Update CI Badge on README.MD (mimblewimble#690)

* Trigger CI on push and pull request (mimblewimble#693)

* Update versioning to 5.2.0-beta.1 against grin 5.2.0-beta.3 (mimblewimble#691)

* update versioning to 5.2.0-beta.1 against grin 5.2.0-beta.3

* tweak for CI trigger

---------

Co-authored-by: Quentin Le Sceller <[email protected]>

---------

Co-authored-by: Quentin Le Sceller <[email protected]>

* clean up warnings in libwallet crate

* clean up warnings in controller crate

* update all contract tests with awareness of new proof structure

…#695)

* integrating onion library

* updates and changes to support newly included mwmixnet types

* add (incorrect) owner api function

* turn off test for now

* switch working grin branch to master

* fix doctests for build

* update cargo lock in attempt to fix croaring build on CI server

* update cargo lock with upstream thiserror crate

* update test dependency for croaring

* Add self spend transaction state

* subtle errors with output states and tx lookups - fixes

* add V5 deserialization test + fixes

* clarify comment

* upwrap fix during v4 deserialization

* further unwrap removal

* add tests + legacy self send cancel

* add missing file

…racts (mimblewimble#712)

…imble#714)