Additions:
- Added warning messages in the console when a storm tries to start with all invalid worlds.
- Added support to the Acidrain info command message to support the warning time. (requires message.yml regeneration)

General Changes:
- Fixed a NPE when reloading / disabling the plugin or stopping the server.
- Fixed an IOException related to version checker.
- Fixed a OutOfBoundsException when a storm tried to start with no valid worlds.
- Fixed the Acid Rain warning time not working as intended.
- Fixed stopping Acid Rain while the warning time was on causing a NPE.
- Fixed a NPE with the main task while using AllStormsAcid.
- Removed some unused configuration options which should have been removed with v3.3.0
- Acidrain storms will no longer start automatically via the plugin is AllStormsAcid is set to true. (This is to prevent errors and bugs)
- Removed unused code.
- Made some slight optimizations to how the Acid rain damaging system works.