Initial conditional rendering support (#1012)

* Initial conditional rendering support

* Properly reset state

* Support conditional modes and skeleton a counter cache for future host conditional rendering

* Address PR feedback

Ryujinx.Graphics.Gpu/Memory/UnmapEventArgs.cs

@@ -0,0 +1,14 @@
+namespace Ryujinx.Graphics.Gpu.Memory
+{
+    public class UnmapEventArgs
+    {
+        public ulong Address { get; }
+        public ulong Size { get; }
+
+        public UnmapEventArgs(ulong address, ulong size)
+        {
+            Address = address;
+            Size = size;
+        }
+    }
+}