Make max anisotropy configurable (#1043)

* Make max anisotropy configurable

* Move opengl command to opengl project

* Add GUI option

Ryujinx.Graphics.Gpu/GraphicsConfig.cs

@@ -5,6 +5,11 @@ namespace Ryujinx.Graphics.Gpu
     /// </summary>
     public static class GraphicsConfig
     {
+        /// <summary>
+        /// Max Anisotropy. Values range from 0 - 16. Set to -1 to let the game decide.
+        /// </summary>
+        public static float MaxAnisotropy;
+
         /// <summary>
         /// Base directory used to write shader code dumps.
         /// Set to null to disable code dumping.