simple instance now works!

- "/dungeon" is now replaced by "/lom"
- /lom create & /lom edit now are mergerd into /lom editor
- added /lom reload
- added /lom save. If someone leaves an instance without launching this
command, he will lose every changing
- /lom list is now showing only instances worlds and not the default too
- config.yml is automatically stored in LoM folder at the first launch
of the plugin
- folder Instances is automatically generated as subfolder of LoM
- Zughy OP xoxo