[FA]{issue} I86 - Stone indicator

Closes #86
-Added stone target indicator
-Added disable method to item
-Changed ambient lighting to 0.15
-Added usage of active (now member of item) to stone
-Some stone value changes
[FA]{refactoring} unnecessary Playscreen fields

Removed unnecessary Playscreen fields
[FA]{refactoring} refactoring

-Removed clamp method from MathSneakQuest and use libgdx's clamp instead
-Added Volume Enum
-Added StartRotation Enum
-Added start rotation setting in map config file
-Attempting setting Map selection ScrollPane scrollbar position based on
the selected item (failed)
[FA]{issue} I58 - more maps

Closes #58
-Added 1 map
-Changed elite watchman max detection time to 2f
-Added start rotation value for enemies to configs
-Fixed PlayScreen condition for enemies to not need to have a flashlight
to cause a game over when their detection timer reaches 0