[Client] Add shuffle players option and turn order dialog

Adds the 'Shuffle players at start' checkbox to game creation and a
host-only 'Set turn order...' action that opens a dialog to reorder or
randomize the seats before the game starts. Seating changes are shown in
the game's message log.

cockatrice/src/interface/widgets/dialogs/dlg_create_game.h

@@ -51,6 +51,7 @@ private:
     QCheckBox *spectatorsAllowedCheckBox, *spectatorsNeedPasswordCheckBox, *spectatorsCanTalkCheckBox,
         *spectatorsSeeEverythingCheckBox, *createGameAsJudgeCheckBox, *createGameAsSpectatorCheckBox;
     QCheckBox *shareDecklistsOnLoadCheckBox;
+    QCheckBox *shufflePlayersCheckBox;
     QDialogButtonBox *buttonBox;
     QPushButton *clearButton;
     QCheckBox *rememberGameSettings;