heavy rework of our input system

- implement the InputController abstract class, an adapter class for any HID interface to use common controller methods relevant to Heaven Studio
- implement InputKeyboard and InputJoyshock classes, for keyboard input and controllers driven by JoyShockLibrary respectively
- add Linux compile of JoyShockLibrary

Assets/Scripts/GameManager.cs

@@ -198,7 +198,7 @@ namespace HeavenStudio
         // LateUpdate works a bit better(?) but causes some bugs (like issues with bop animations).
         private void Update()
         {
-            PlayerInput.UpdateJoyShocks();
+            PlayerInput.UpdateInputControllers();
 
             if (BeatmapEntities() < 1) //bruh really you forgot to ckeck tempo changes
                 return;
@@ -528,12 +528,5 @@ namespace HeavenStudio
         {
             HeavenStudio.GameCamera.ResetAdditionalTransforms();
         }
-
-        void OnApplicationQuit()
-        {
-            Debug.Log("Disconnecting JoyShocks...");
-            JSL.JslSetCallback(null);
-            JSL.JslDisconnectAndDisposeAll();
-        }
     }
 }