* 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
* tor bridge config and args
* migration `config_file_version=2`
* small fixes typo, comment etc..
* support: snowflake, meek_lite, obsf4 and tor proxy
* remove useless serde
* improve migrate function
* few fixes
* add bridge flags to pay and receive + few fixes
* some improvements
* 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
* udpate for beta release
* initial tor explorations
* rustfmt
* basic tor tx send working
* rustfmt
* add tor proxy info to config file
* rustfmt
* add utilities to output tor hidden service configuration files
* output tor config as part of listener startup
* rustfmt
* fully automate config and startup of tor process
* rustfmt
* remove unnecessary process kill commands from listener
* rustfmt
* assume defaults for tor sending config if section doesn't exist in grin-wallet.toml
* rustfmt
* ignore tor dev test
* update default paths output by config, compilation + confirmed working on windows
* rustfmt
* fix on osx/unix
* add timeout to tor connector, remove unwrap in client
* allow specifiying tor address without 'http://[].onion' on the command line
* fix api test
* rustfmt
* update address derivation path as per spec
* rustfmt
* move tor init to separate function
* rustfmt
* re-ignore tor dev test
* listen on tor by default if tor available
* rustfmt
* test fix
* remove explicit send via tor flag, and assume tor if address fits
* rustfmt
