add global hardening against RAM exhaustions in safe_size #348
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This pull request seeks to harden CImg against RAM exhaustions.
cimg_max_file_sizehas been renamend tocimg_max_buf_sizeand a check was implemented insidesafe_sizeto prevent sizes that are too large. This gives the user of the lib more control over possible resource consumption. Everywheresafe_sizeis used, cimg now checks if this size is within the user specified limits.