* Added a multisig example contract

* Added crate documentation

* Update examples/multisig_plain/lib.rs

shortcut for iter over references

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/multisig_plain/lib.rs

rename ensure_from_owner

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/multisig_plain/lib.rs

renaming

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/multisig_plain/lib.rs

renaming

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/multisig_plain/lib.rs

renaming

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* renamings

* Better name for internal_confirm

* Renamed id -> trans_id

* Better name for ensure_requirement

* Renamed to confirm_by_caller

* Reformat conform_by_caller

* Remove unwraps in favor of expect

* More documentation

* Added license header

* Fix style issue in documentation

* Updated documentation

* Add warning about not using this in production

* Remove run_test for now as it's not working

* Fix metadata generation

* Use the EnvTypes type alias provided by the contract macro

* fix typo

* Emit Events

* Fix doc typos

* Do actual checking in contract_works test

* Added more tests (currently failing)

* Replace HashMap with BTreeMap

* Add docs regarding privileged wallet messages

* Added tests

* Update examples/multisig_plain/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/multisig_plain/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Remove superflous .cargo/config

* Add proper author information to manifest

* Update examples/multisig_plain/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/multisig_plain/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Apply suggestions from code review

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* gas_limit is not measured in Balance

* Update examples/multisig_plain/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Switch owners, requirement argument position

* Remove mutate_map and use entry api instead

* Split execute into invoke and eval

This allows for evaluating the result of a call if needed.

* Remove superflous self argument of ensure_requirement_is_valid

* Switch parameterize_call arguments

* Return ConfirmationStatus after doing a confirmation

* Remove superflous insert into confirmation_count

* Rework public documentation

* Missing empty line in docs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Unify exection Events

* Rework add_owner example to have an actual chance of compiling

* Remove redundant closure

Co-authored-by: Hero Bird <robin.freyler@gmail.com>