Implement Counter Queue and Partial Host Conditional Rendering (#1167)

* Implementation of query queue and host conditional rendering

* Resolve some comments.

* Use overloads instead of passing object.

* Wake the consumer threads when incrementing syncpoints.

Also, do a busy loop when awaiting the counter for a blocking flush, rather than potentially sleeping the thread.

* Ensure there's a command between begin and end query.

Ryujinx.Graphics.Gpu/Memory/MemoryManager.cs

@@ -181,13 +181,13 @@ namespace Ryujinx.Graphics.Gpu.Memory
         {
             lock (_pageTable)
             {
+                // Event handlers are not expected to be thread safe.
+                MemoryUnmapped?.Invoke(this, new UnmapEventArgs(va, size));
+
                 for (ulong offset = 0; offset < size; offset += PageSize)
                 {
                     SetPte(va + offset, PteUnmapped);
                 }
-
-                // Event handlers are not expected to be thread safe.
-                MemoryUnmapped?.Invoke(this, new UnmapEventArgs(va, size));
             }
         }