Captain Comic: Add list of permitted tiles, and fix a memory leak
Cosmo: Add list of permitted tiles
Dangerous Dave: Add list of permitted tiles
Wacky Wheels: Add list of permitted tiles
Word Rescue: Add list of permitted tiles
Halloween Harry: Add list of permitted tiles
New test to ensure list of valid map codes is at least somewhat populated
Add extra line in test failure output for clarity
Word Rescue: Last element is not a terminating null but another list of items

This allows E1L4 to load correctly, among other levels.
Word Rescue: Remove .d* files as dependencies as they are actually unused
Add fourth layer to test code and add more detail to test error messages
Word Rescue: Add support for animated tiles, foreground tiles and drips
Xargon: Remove some invalid code that somehow compiles with GCC
Add another test to ensure list of valid tiles have coords of (0,0)

This makes it easier when presenting the tiles in the Studio GUI, because the
coordinates don't have to be changed when selecting tiles.
Word Rescue: Use image dims not layer tile size for object layers

This results in things like the exit door showing at the correct size instead
of being squished down to an 8x8 image to match the layer's tile size.
Update boost.m4