Memory Changes part 2

* Slightly refactors RangeLists from the last Memory Changes MR, which fixes issue 61.

* Convert as many const size array iterators to span iterators as possible. When iterating over a const size array, every iteration created a Span, now only the first iteration does in most places.

* Now using object pooling for a few object types that were rapidly deleted and recreated.

* Converted a few flag checks to binary operations to save memory allocations.

src/Ryujinx.Input/IGamepad.cs

@@ -95,25 +95,28 @@ namespace Ryujinx.Input
         {
             // NOTE: Update Array size if JoystickInputId is changed.
             Array3<Array2<float>> joysticksState = default;
+            Span<Array2<float>> joysticksStateSpan = joysticksState.AsSpan();
 
             for (StickInputId inputId = StickInputId.Left; inputId < StickInputId.Count; inputId++)
             {
                 (float state0, float state1) = gamepad.GetStick(inputId);
 
                 Array2<float> state = default;
+                Span<float> stateSpan = state.AsSpan();
 
-                state[0] = state0;
-                state[1] = state1;
+                stateSpan[0] = state0;
+                stateSpan[1] = state1;
 
-                joysticksState[(int)inputId] = state;
+                joysticksStateSpan[(int)inputId] = state;
             }
 
             // NOTE: Update Array size if GamepadInputId is changed.
             Array28<bool> buttonsState = default;
+            Span<bool> buttonsStateSpan = buttonsState.AsSpan();
 
             for (GamepadButtonInputId inputId = GamepadButtonInputId.A; inputId < GamepadButtonInputId.Count; inputId++)
             {
-                buttonsState[(int)inputId] = gamepad.IsPressed(inputId);
+                buttonsStateSpan[(int)inputId] = gamepad.IsPressed(inputId);
             }
 
             return new GamepadStateSnapshot(joysticksState, buttonsState);