Add alpha channel to preview

Move preview rendering into HWMap

- Make world wrap edges not depend on gear radius - Camera jumps on wrap such that gear position on the screen doesn't change - Small fix to cmake script

move the freeModule too, couple of style tweaks

fix molotov sprite too

tweak dynamite sprite (pixels at frame border, leading to visible filtering artifacts when zoomed)

merge

change how textures from non-power-of-2-width textures are filled. this fixes e.g. the vertical lines appearing between Bath theme's horizontL

minor comments fix

add preview init to tunnels too