Unfortunately, GML widget registration requires a non-fallible construct
method to create the widget. So this does a bit of manual error checking
when loading the food bitmaps.
The former is required for GML, and the latter is to avoid the verbosity
and redundancy of Snake::SnakeGame (and matches most other games in the
system).
Otherwise, we end up propagating those dependencies into targets that
link against that library, which creates unnecessary link-time
dependencies.
Also included are changes to readd now missing dependencies to tools
that actually need them.
