Added cross-play and several fixes/changes to Chapter 6

Added cross-play support in preparation for the console release.

The Miner has had their vision reduced and will no longer aggro onto players behind him.

Fixed an error with grass that prevented it from spawning correctly in chapter 5, chapter 6 and the swamp/dead forest case files.

Chapter 6 now resets lives in the final area, and revival bracers can be found scattered around.

The mining lantern in chapter 6 (and found in case files) has had a significant brightness increase.

Fixed a bug which resulted in the sliding puzzle in chapter 6 sometimes breaking.

Fixed a bug where the flashlight didn't "break" correctly in chapter 6.