Added password authentication as server feature (#8716)

* Added authenticate and setPassword

* Added AuthPopup

* Added auth endpoint to UncivServer

* Fixed merge confict

* Added close button to AuthPopup

+ Fixed crash if no server is available

* Added entries to template properties

* Fixed setting password does not work

if authentication is required

+ Added server check on game startup in case the server has changed its feature set

* Added support for different passwords

on different servers

+ Cleanup for MultiplayerTab

* Added current password as hint

+ removed character hiding in auth popup
+ added popup to indicate auth success on connection check

android/assets/jsons/translations/template.properties

@@ -612,6 +612,16 @@ Days =
 Server limit reached! Please wait for [time] seconds = 
 File could not be found on the multiplayer server = 
 Unhandled problem, [errorMessage] = 
+Please enter your server password = 
+Set password = 
+Failed to set password! = 
+Password set successfully for server [serverURL] = 
+Password = 
+Your userId is password secured = 
+Set a password to secure your userId = 
+Authenticate = 
+This server does not support authentication = 
+Authentication failed = 
 
 # Save game menu