Added WQHD Resolution Option and Title/In-Game Music

[list] [*] Added WQHD (2560x1440) resolution option to settings menu [*] Deleted ambient sound and added in title/in-game music [*] Fixed small bug where tutorial dialog was shown when loading Level1 save games [*] Updated credits [*] Fixed typos in tutorial (german, english) [/list] [img]{STEAM_CLAN_IMAGE}/41589453/bcd4a12712a7a779233513da6150b29434056571.png[/img]