[libredwg] [task #9858] Clean debugging messages and return error codes

[Reini Urban]

Follow-up Comment #1, task #9858 (project libredwg):

I agree.

Currently we enforce printing error messages on the WARN and ERROR level,
and I've added more error status returns.

What needs to be added are some symbolic error status numbers into dwg.h
or maybe even an enum, and use them instead.

Out of memory, out of bounds, failed to read class, failed to write class, crc
error and more of such.

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