- Add support for incremental gap filling. Does gap filling in multiple passes, allows us to limit patch size growth to some fixed percentage
- Fixed cooker order UEXP files (previously these were unordered, which could actually result in patches increasing in size after gap filling)
- Added better method for measuring fragmentation - reports as a percentage, takes order index into account
- Refactored OrderMapping via new FPakOrderMap class which knows about primary/secondary mappings
- Added various schemes for defragmentation, including OnePass method which matches legacy behaviour, and various incremental schemes. Incremental_PrimaryFirst seems to give best results
#rb hongyi.yu
#ROBOMERGE-SOURCE: CL 5688530 via CL 5688536 via CL 5688538 via CL 5690113 via CL 5694330
[CL 5694501 by ben woodhouse in Main branch]
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