Allow any shader SSBO constant buffer slot and offset (#2237)

* Allow any shader SSBO constant buffer slot and offset

* Fix slot value passed to SetUsedStorageBuffer on fallback case

* Shader cache version

* Ensure that the storage buffer source constant buffer offset is word aligned

* Fix FirstBinding on GetUniformBufferDescriptors

src/Ryujinx.Graphics.Shader/BufferUsageFlags.cs

@@ -6,7 +6,7 @@ namespace Ryujinx.Graphics.Shader
     /// Flags that indicate how a buffer will be used in a shader.
     /// </summary>
     [Flags]
-    public enum BufferUsageFlags
+    public enum BufferUsageFlags : byte
     {
         None = 0,