Auroras

• Auroras now rotate slowly (configurable) when crossing a polar boundary/point
• Added a config for configuring distance between bands
• Added aurora polar offset config, meaning that the "magnetic" poles can shift from day to day, allowing the auroras to appear further south or north than normally
• Improved aurora calculations
• Fixed code not actually using modulo, where it calculated the remainder (%) before (tf Java!?)
• Improved compatibility with Simple Clouds

Resetting/deleting the configs is recommended!