Form: allow ESC key to clear search filter

Renamed older settings to pre-526.47 (might be nice if we had a
MaxDriverVersion property in there)

Added TILEDCACHE_L2_USAGE to Reference too.

Thanks to Guzz from guru3d for these new settings!

Changed spaces -> tabs in XML, since that seems to be VS default

nspector/frmDrvSettings.Designer.cs

@@ -573,6 +573,7 @@
             this.txtFilter.TabIndex = 82;
             this.txtFilter.WatermarkText = "Search for setting...";
             this.txtFilter.TextChanged += new System.EventHandler(this.txtFilter_TextChanged);
+            this.txtFilter.KeyUp += new System.Windows.Forms.KeyEventHandler(this.txtFilter_KeyUp);
             // 
             // frmDrvSettings
             // 

nspector/frmDrvSettings.cs

@@ -1393,6 +1393,7 @@ namespace nspector
 
             else if (e.KeyCode == Keys.Escape)
             {
+                txtFilter.Text = "";
                 RefreshCurrentProfile();
             }
 
@@ -1537,6 +1538,14 @@ namespace nspector
             
             Clipboard.SetText(sbSettings.ToString());
         }
+
+        private void txtFilter_KeyUp(object sender, KeyEventArgs e)
+        {
+            if (e.KeyCode == Keys.Escape)
+            {
+                txtFilter.Text = "";
+            }
+        }
     }
 }