Changes

• An initial code refactor has been performed.
• Unused code has been removed.
• "Artifacts" in water reflections have been reduced.
• Water lighting in caves has been fixed.
• Vanilla water now integrates correctly with Distant Horizons water.
• Shadows now use two additional samples to improve quality, especially during motion and when temporal sampling is not used.
• Default cloud samples have increased from 7 to 10.
• The "Witness" color scheme has been added.