Some small extra features and optimisations

+ More refactoring and code optimisations
+ Changed use-worldedit argument for cuboid from -s to -r (region)
+ Added support for using worldedit sphere regions to set/view radius qt
ranges
+ Added option to hide specific QTs from dynmap
+ Added per-QT price multipliers
+ Added tab-completion for qt names, admin commands and cfg option names
+ Added cfg option to enable/disable dynmap functions