Added sound volume control for swing GUI (in settings menu)
Added sound volume control for swing GUI (in settings menu)

Peter-Maximilian/settlers-remake,andreas-eberle/settlers-remake,jsettlers/settlers-remake,jsettlers/settlers-remake,andreasb242/settlers-remake,phirschbeck/settlers-remake,andreasb242/settlers-remake,phirschbeck/settlers-remake,andreasb242/settlers-remake,andreas-eberle/settlers-remake,JKatzwinkel/settlers-remake,phirschbeck/settlers-remake,andreas-eberle/settlers-remake,jsettlers/settlers-remake