Make rewind gun mostly work; todo sound, dropping item, perhaps more

src/Dodge/Creature.hs

@@ -164,6 +164,7 @@ startCr = defaultCreature
 startInvList :: [Item]
 startInvList =
     [ rewindGun
+    , pistol
     ]
 startInventory :: IM.IntMap Item
 startInventory = IM.fromList $ zip [0..defaultInvSize -1] $ startInvList ++ repeat NoItem

src/Dodge/Data.hs

@@ -55,6 +55,7 @@ type CRUpdate = Creature -> World -> (Endo World, Maybe Creature)
 data World = World 
     { _keys                 :: !(S.Set Scancode)
     , _mouseButtons         :: !(S.Set MouseButton)
+    , _mousePos             :: !Point2
     , _cameraCenter         :: !Point2
     , _cameraRot            :: !Float
     , _cameraZoom           :: !Float
@@ -78,7 +79,6 @@ data World = World
     , _floorItems           :: IM.IntMap FloorItem
     , _floorTiles           :: [(Point3,Point3)]
     , _randGen              :: StdGen
-    , _mousePos             :: !Point2
     , _testString           :: World -> [String]
     , _modifications        :: IM.IntMap Modification
     , _yourID               :: !Int
@@ -116,6 +116,7 @@ data World = World
     , _preloadData          :: PreloadData
     , _savedWorlds          :: M.Map SaveSlot World
     , _rewindWorlds         :: [World]
+    , _rewinding            :: Bool
     , _frameClock           :: Int
     }
 

src/Dodge/Default/World.hs

@@ -85,6 +85,7 @@ defaultWorld = World
     , _frameClock = 0
     , _worldBounds = defaultBounds
     , _rewindWorlds = []
+    , _rewinding = False
     }
 youLight :: TempLightSource
 youLight = 

src/Dodge/Item/Weapon/Utility.hs

@@ -32,9 +32,20 @@ rewindEffect iteff cr invid w = w & rewindWorlds %~ (take 100 . (w' : ))
 
 useRewindGun :: Item -> Creature -> World -> World
 useRewindGun it cr w = case _rewindWorlds w of
-    (_:w':ws) -> w' & keys .~ _keys w
+    (w':[]) -> w'
-        & mouseButtons .~ _mouseButtons w
+        & upbuts
+        & rewindWorlds .~ []
+        & rewinding .~ True
+        & lClickHammer .~ HammerUp
+      where
+        upbuts = (keys .~ _keys w) .  (mouseButtons .~ _mouseButtons w)
+    (_:w':ws) -> w'
+        & upbuts
         & rewindWorlds .~ ws
+        & rewinding .~ True
+        & lClickHammer .~ HammerUp
+      where
+        upbuts = (keys .~ _keys w) .  (mouseButtons .~ _mouseButtons w)
     _ -> w
 
 shrinkGun :: Item