Separate GPU engines (part 2/2) (#2440)

* 3D engine now uses DeviceState too, plus new state modification tracking

* Remove old methods code

* Remove GpuState and friends

* Optimize DeviceState, force inline some functions

* This change was not supposed to go in

* Proper channel initialization

* Optimize state read/write methods even more

* Fix debug build

* Do not dirty state if the write is redundant

* The YControl register should dirty either the viewport or front face state too, to update the host origin

* Avoid redundant vertex buffer updates

* Move state and get rid of the Ryujinx.Graphics.Gpu.State namespace

* Comments and nits

* Fix rebase

* PR feedback

* Move changed = false to improve codegen

* PR feedback

* Carry RyuJIT a bit more

Ryujinx.Graphics.Gpu/Engine/MmeShadowScratch.cs

@@ -3,6 +3,9 @@ using System.Runtime.InteropServices;
 
 namespace Ryujinx.Graphics.Gpu.Engine
 {
+    /// <summary>
+    /// Represents temporary storage used by macros.
+    /// </summary>
     [StructLayout(LayoutKind.Sequential, Size = 1024)]
     struct MmeShadowScratch
     {