Vague "File Not Found" Error Handling

[bazz1tv]

(As depicted via images at the top of #9)

The easiest fix would be to just add the path string to the error message to be more informative.

The best fix would be to reform the error handling mechanics that respond to errors abroad in the program. First, starting with the mouse cursors asset BMP files. What would be great is to add ability to fail gracefully when certain files somehow go missing that are not essential, such as these optional cursors.

By simply a bit flag or boolean to the relevant data structure, mouse cursor objects can be ignored by the program when their asset files have gone missing.