Light sources height, support for small resolutions, zoom increased

[list] [*] Light sources can now be raised. Light sources are now also rendered above objects [*] Auto UI scaling for resolutions smaller than 1920x1080 e.g. 1360x768 [*] Zoom level increased. Quality reduction at high zoom levels. (Marking in the zoom slider) [*] Deco Images: Maximum height increased. Height by button and keys, as with objects [*] Environment: Fog Color added [*] Map Settings: Slider for Grid Opacity added [*] Minor things [/list]