[UNTESTED] Fix integer overflow when reading late object properties in big files. Better V11 CustomItemDatas redirection support.

[alex4401]

This should address a bad integer offset (or rather a property table over-read within wrong context) mentioned under #5.

Largely untested, nowadays I don't play ARK and don't have any save file collection nor the time needed to wait for these files to load and import into ASB.

• The first commit fixes an overflow that occurs when calculating the absolute property table offset of later objects in big save files.
• The second two commits attempt to solve CustomItemDatas (later "CID" for short) reading.
• • I've drawn a few far-fetched conclusions on WC's implementation that seem very likely to me - therefore I've redone how we handle CID after Implemented basic support for V11 file format. #5 to ensure we don't reinterpret raw array contents outside of the property table read.
• • Ian reported seeing variable sizes of the "redirectors" - turns out the relocated data isn't sufficient to reconstruct an FCustomItemData struct we've seen in V9 as class and object references are missing. It appears those references are still written to the primary archive (the array). This should be now handled.