Changed, Numeric textboxes: you can now hold Ctrl or Shift keys while clicking...

Changed, Numeric textboxes: you can now hold Ctrl or Shift keys while clicking a textbox buttons or using mouse wheel on a textbox to change value increment step.
Changed, Numeric textboxes: trailing zeros are no longer displayed to reduce visual noise.
Fixed, paired numeric controls: in some cases culture-specific decimal separator was not used.
Fixed, map loading: inability to initialize D3D device is now handled a bit more gracefully.
Fixed, main toolbar context menu: we should suppress context menu closing only when user clicks on a menu item while holding Shift key.
Fixed, Game configurations: several Skulltag things were not included in many Zandronum game configurations.