Changed memory history to be kept after user logout.
- It will be kept while the server has enough free memory
- Use disk instead if you want it kept indefinitely

PlotSquared hook: Added command /plot trimchunks <world> <trim-unowned>
- It will output a duplicate world with all the trimmed chunks removed
- Usage example: /plot trimchunks plotworld true
- You need spare disk space to use this

Only owners of a region can rollback:
- i.e. It's safe to give normal players access to the rollback command (tested with PlotSquared)

prevent-crashes is now disabled by default
- Since it discards parts of an edit when low on memory
- And this behavior is slower or could confuse people

Proper support for WorldEdit inventory
- Per player inventory mode (0, 1, 2)
- Use mode 2 for survival (setting air doesn't give you the blocks)
- Fixes several duplications glitches
- Adds speed and placement type option per player
- See config for more info

Faster compression
- Uses optimized PIGZ algorithm instead of GZIP (like 10x faster)
- Affects schematics, history on disk (level 9), and upload/download

Fixes:
- Fix identical states being recorded as a change
- Fix concurrent entity creation
- Fix clipboard paste error
- Fixes chunk sending when block placement is really slow
- Fixes for Anvil