Reworked database + Fixed plot move

- Reworked the way plots are loaded, will break plugins that use .plots
- Made plot move work for torches and other stuff, seems stable now.
Inspired by worldedit.
Better plot clearing

- Plots are now cleared progressively
- While the plot is being cleared, user is notified of the progress
- Some tweaks to createworld command to ignore case
- Some tweak to worldedit mask update
Merge pull request #4 from ZachBora/DatabaseRework

Database rework