* updated util and libwallet with thiserror
* update impl crate to thiserror
* api crate converted to thiserror
* update of controller crate to thiserror
* update final bin + tests to thiserror
* update unused import
* remove failure derive
* reset import of grin to master
* update cargo lock
* update from master
* remove grin libs re-export from util crate :(
* temp local
* point code at bleeding edge grin master branch
* initial addition of ov3
* move libwallet address functions into OnionV3Address type
* incorporate OnionV3 type where possible
* factor out manual dalek pubkey manipulations
* corrections due to test failures
* change json-rpc example to use ov3 for payment proof recipient address
* refactor address generation code into libwallet, bool to flag whether to include proof, add sender address in init_send_tx
* rustfmt
* require payment proof addr as part of init_tx
* rustfmt
* store payment proof on sender transaction side
* rustfmt
* change sig to ed25519 sig
* rustfmt
* add message creation and signature
* rustfmt
* add payment proof verification function
* rustfmt
* validate proof on sender side, store proof
* rustfmt
* fix json tests
* fixes and updates to tests
* added API functions for converting and retrieving proof addresses
* rustfmt
* add payment proof to init_send_tx example
* rustfmt
* incorrect comment
* add commands for requesting payment proofs
* rustfmt
* wire up payment proofs into command line
* rustfmt
* add address command
* rustfmt
* added tor sending from owner api
* rustfmt
* refactor address generation code into libwallet, bool to flag whether to include proof, add sender address in init_send_tx
* rustfmt
* require payment proof addr as part of init_tx
* rustfmt
* store payment proof on sender transaction side
* rustfmt
* change sig to ed25519 sig
* rustfmt
* add message creation and signature
* rustfmt
* add payment proof verification function
* rustfmt
* validate proof on sender side, store proof
* rustfmt
* fix json tests
* fixes and updates to tests
* added API functions for converting and retrieving proof addresses
* rustfmt
* add payment proof to init_send_tx example
* rustfmt
* incorrect comment