Bug [2817070]  PropertySheet saves empty hotkey as null     * Convert to use a standard HotKeyConfigurer
Bug [2817070]  PropertySheet saves empty hotkey as null  
  * Convert to use a standard HotKeyConfigurer

git-svn-id: ae08250ad33602a4155ea07c044985523749a64a@5854 67b53d14-2c14-4ace-a08f-0dab2b34000c

rzymek/vassal-src,rzymek/vassal-src