[GREENFOOT-288] Out of memory in heap space occurs when continuously re-compiling a large world image.

I have a .png that is just under 2 mega bytes in size which will cause the error shown below when compiled a large amount of times.

I caused this when compiling a lot of times in general use.

I could not recreate this in 1.5.6 with a similar number of re-compiles.

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