This change comprises of multiple smaller changes:
- Convert all WriteToDat to WriteToDatFromDict, including MissFile
- Change obsolete Import to use updated ParseDict
- Remove all references to Parse
- Rename all references to "Dict" specific code to shorter names
- Remove more unused methods rendered obsolete by other changes
Basically, if a rom is a duplicate, it can be a duplicate within a system or source or across system or source, and by hash alone or by all data matching. The four combinations make an enum now and the diff function is the only one that uses them right now. If we're in dedup mode, we want to check hashes only in diff. Otherwise, we want to check against ones that match all information. This needs field testing.
