Minor Performance

- Clear image cache if necessary (prevent clearing if the downloaded data is not image)
- Cache missing cards (prevent finding missing cards unless the user has fetched/downloads an image)
- Clear preselected options for New Gauntlet Match (easier to filter decks for Gauntlet)

forge-gui-mobile/src/forge/GuiMobile.java

@@ -288,6 +288,7 @@ public class GuiMobile implements IGuiBase {
     @Override
     public void clearImageCache() {
         ImageCache.clear();
+        ImageKeys.clearMissingCards();
     }
 
     @Override

forge-gui-mobile/src/forge/assets/ImageCache.java

@@ -113,6 +113,7 @@ public class ImageCache {
 
     public static void clear() {
         missingIconKeys.clear();
+        ImageKeys.clearMissingCards();
     }
 
     public static void disposeTexture(){

forge-gui-mobile/src/forge/screens/gauntlet/NewGauntletScreen.java

@@ -113,7 +113,7 @@ public class NewGauntletScreen extends LaunchScreen {
                         });
                     }
                 });
-                chooser.show(null, true);
+                chooser.show(null, false); /*setting selectMax to true will select all available option*/
             }
         });
     }