Tweak napalm so it'll hit on the X without wind. Unlike bombs / minestrike, should not depend on height of X.

Engine: + Play sound when switching hogs + Save screenshots to home directory instead of working directory + Use Windows bitmap format for screenshots under Win32 (more common and better supported) * Fix compiler warnings

smaller improvements in mouse handling

Engine: * Keep blowtorch and other weapons from penetrating indestructible terrain (e.g. solid borders) * Reduced explosion background borders Frontend: + Show unknown or missing maps in room list by tinting them red