- Added `NetherAccess` class to manage Nether access state and commands.
- Introduced `NetherOpeningSchedule` for polling Nether opening times.
- Created `NetherAccessListener` to handle portal events and deny access when closed.
- Implemented `NetherCommand` for public information about Nether access.
- Added `NetherPreventCommand` for controlling Nether access via commands.
- Enhanced `DimensionScheduleText` to include Nether-specific messages and colors.
- Refactored `EndOpeningSchedule` to utilize `OpeningAnnouncements` for managing announcements.
- Updated `DimensionScheduleCommand` to display Nether opening times.
- Improved README documentation to reflect new Nether functionality and commands.
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