[1.06][Bug] Create Sovereign fails to save XML file due to double-quotes in sovereign name

When creating a sovereign, the game allows you to include double-quotes (") in the sovereign name.  On save, it attempts to create a file name like:

"Sovereign Name"_-1234567890-10.xml

This fails because these are all illegal filename characters in Windows: " \ / : * ? < > |

Further, the game does not warn the user and prompt for a new name.  Instead, it silently fails, and the newly-created sovereign is mysteriously unavailable when you restart the game.