Optional Tor Send/Listen Functionality (#226)

* 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

libwallet/src/error.rs

@@ -213,6 +213,14 @@ pub enum ErrorKind {
 	#[fail(display = "Supplied Keychain Mask Token is incorrect")]
 	InvalidKeychainMask,
 
+	/// Tor Process error
+	#[fail(display = "Tor Process Error: {}", _0)]
+	TorProcess(String),
+
+	/// Tor Configuration Error
+	#[fail(display = "Tor Config Error: {}", _0)]
+	TorConfig(String),
+
 	/// Other
 	#[fail(display = "Generic error: {}", _0)]
 	GenericError(String),