Pk11 - Major refactor: Don't keep JSON around after loading, switch to RapidJSON
This is WIP! I have only changed some of the JSON over to RapidJSON, there's still more work to do. The most notable improvements are on inital load and in the UniStore list. I hope this is free of regressions, but its a huge commit, there might be some regressions -- be warned if using git builds. Please let me know anything that's broken.