Corrupt bnk file after repacking about tdumt

[djey47]

Other issue in dealer interior: icd12a2.bnk or icd12e2.bnk, can't just replace single .wav file in them.

Two interesting findings:

• last size info acts just as a pointer to the end of last real packed file (previously used as info for padding file); start address in this size info should be end of the packed file, without its own padding.
• this last size info should have file length to 0 to indicate it's the beginning of padding

[djey47]

As per PR: https://github.com/djey47/tdumt/pull/2/files

some fixes have been made, now testing in progress (with game engine)

STILL FAILING:

• icd_12e2.bnk
• icd_8f.bnk
• icd_10a.bnk
• icd_15a.bnk
• ibd_12c.bnk