Rudimentary support for the NES Zapper (unix)
Added crosshair cursor for Zapper (unix)
Crosshair only shows when a Zapper is present (unix)
Added rewinder and coin insert back to keyboard input (unix)
Added picture options (unix)
Added palette selection (unix)
Added decoder selection (unix)
Palette options (libretro)
Added center dot back to crosshair cursor (unix)
Refactored filesystem-related code and some general cleanup (unix)
Fixes for MinGW (unix)