- Added a new config var: 'nomcdragonrespawn'
Setting this to 'true' will block the server from respawning a dragon at server restart if the dragon has NOT been killed before. (Or if it was killed, but creation of portals was disabled...(endportal and/or gateways)).
This is done by creating a small portal in a hidden place the player can not reach, but which is recognized by the game...

- Added commands for changing config values and a new permission: 'dragonslayer.admin'. Only with this permission (or as an OP) you can change config values for worlds by using this plugin commands.
This permission includes all other permissions...

- Fixed a small bug in dragon counting

- Some more code cleanups and error handling.....