[VERSION TRACK] 6.0.0 Alpha Testing

# Known Bugs - v6.0.0

This issue is an umbrella issue to keep track of bugs in the current version. You can reply directly here, but opening a new issue would make life easier for us.

6.0.0 is very, very alpha - there are rough edges all over. Apologies for yet another major version bump, but after a lot of consideration, the parser has been re-written in rust (tl;dr : it compiles to machine code, and in general testing is somewhere between 5x and 10x faster than the pure javascript parser.)

## Known Issue List
- [x] bunch of missing language keys, since added
- [x] occasionally the category and brand listing in the main interface duplicates some items - fixed
- [x] the old cache is invalid. the 5.9.80 build **does not handle this**, you have to manually rebuild. This step needs to be automated.
- [x] some mods that passed the old parser fail the new one (bad xml prologue - the new parser is right, but the giants engine lets them through too - need to investigate relaxing the parser a little)
- [x] copy function not working?
- [ ] does onedrive sync mode still need to be there? The new parser does the UUID a little differently, did I already make a safe decision here?
- [x] add trap for "none" brand (there is an image now, and it probably shouldn't display)
- [x] basegame category list should ignore empty categories (this may fix all the missing images
- [x] basegame "cartrailer" attachment not being picked up correctly
- [x] ~~REGRESSION: none of the save manage buttons do the right thing. or at least not all of them do~~
- [x] update main display, better layout for title/author/brand/categories
- [x] malware detected crashes MA
- [x] processing dialog not going away after version check/manage