Don't check internal permission node.
Add query / update functions fro table schema version to class Database.
Don't add player's record on player join event when the initialization
of PlayerTable failed.
Add schema upgrade code to PlayerTable.
Import world list into world DB only when a new table is created.
Ignore any exceptions on prepared statements destructions.
Fill in the version of plugin automatically from the POM file.
Downgrade the WorldGuard from version 6.0 to 5.9.

Conflicts:
	pom.xml
	src/main/resources/plugin.yml