Update 2022-06-26 Small fixes

Fixed and added some minor things:

1. Added a reset [R] that will reset the player to the last checkpoint if the dragon gets stuck somewhere and can't move.

2. Added a sign in the game world that shows where the Turtle can't enter.

3. Fixed some shadows and an animation mistake when one of the gates closes in the ruin area.

4. Added some new art for transitioning between different colored ground tiles more smoothly.