Bisq can now use an external Tor service

[freimair]

Bisq can now use an already running Tor service (TorBrowser for example). The feature can be used by supplying the required command line parameters on Bisq start, being:

--torControlCookieFile <Path>           The cookie file for authenticating    
                                          against the already running Tor     
                                          service. Use in conjunction with -- 
                                          torControlUseSafeCookieAuth (default: )
--torControlPassword <String>           The password for controlling the      
                                          already running Tor service. (default: )
--torControlPort <Integer>              The control port of an already running
                                          Tor service to be used by Bisq      
                                          [port]. (default: )
--torControlUseSafeCookieAuth           Use the SafeCookie method when        
                                          authenticating to the already       
                                          running Tor service. (default: )    

In order to get this functionality, the Netlayer dependency and the jtorctl dependency have been bumped to version 0.6 and 1, respectively.

closes #1761, closes #811, closes #492, closes #1887

[ManfredKarrer]

utACK