allow login using hashed passwords (#4464)

* Support getting a user's password salt via initial websocket connection (added to Event_ServerIdentification)

* Nonsense stuff to figure out later

* move passwordhasher to correct location

* protobuf changes

* add ext to protobuf

* implement request password salt server side

* add supportspasswordhash to server identification

* check backwards compatibility

* reset some changes to master

* implement get password salt client side

* implement checking hashed passwords on server login

* check for registration requirement on getting password salt

* properly check password salt response and show errors

* remove unused property

* add password salt to list of response types

Co-authored-by: ZeldaZach <zahalpern+github@gmail.com>

cockatrice/src/localserver.cpp

@@ -42,7 +42,8 @@ AuthenticationResult LocalServer_DatabaseInterface::checkUserPassword(Server_Pro
                                                                       const QString & /* password */,
                                                                       const QString & /* clientId */,
                                                                       QString & /* reasonStr */,
-                                                                      int & /* secondsLeft */)
+                                                                      int & /* banSecondsLeft */,
+                                                                      bool /* passwordNeedsHash */)
 {
     return UnknownUser;
 }