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Segfault if walk outside map

Originally posted by @CrispLake in #6 (review)

Needs information on map bounds so this depends on changes to validate

From subject:

If any misconfiguration of any kind is encountered in the file, the program must exit properly and return "Error\n" followed by an explicit error message of your choice.

So conceptually we could output more meaningful error messages after the initial Error\n.
Errors should also be printed in stderr for good practice.

MLX42 will always print an error for missing files when using mlx_load_png. This could be in conflict with the subject that mandates an "Error\n" to be printed before any more informative messages.