Changed texture filenames to reflect new art
Changed instances in code of filenames
-BeaconOnSand -> BeaconOnStone
-Cactus1 -> BrokenCornerstone
-Cactus3 -> PurplePlant
-ChestOnSand -> CrateOnStone
-GrassInDesert -> GrassInStone
-GravesDesert -> CrumbledRock
-lightSand -> StoneFloor
-PalmOnSand -> CrackedBrick
-SandPath -> StonePath
-SandPathDown -> StonePathDown
-SandPathLeft -> StonePathLeft
-SandPathUp -> StonePathUp
-SkeletOnSand -> SkullOnStone
-SkullOnSand -> BrokenFloor
-WheilOnSand -> BookWithStand
-StoneLeftSide -> BrazierLeftSide
-StoneWithFireLeftSide -> BrazierWithFireLeftSide
-StoneWithFireRightSide -> BrazierWithFireRightSide