Added content unlock menu

core/src/io/anuke/mindustry/game/UnlockableContent.java

@@ -1,5 +1,8 @@
 package io.anuke.mindustry.game;
 
+import com.badlogic.gdx.graphics.g2d.TextureRegion;
+import io.anuke.ucore.scene.ui.layout.Table;
+
 /**Base interface for an unlockable content type.*/
 public interface UnlockableContent extends Content{
 
@@ -8,4 +11,12 @@ public interface UnlockableContent extends Content{
      * Do not use IDs for names! Make sure this string stays constant with each update unless removed.
      * (e.g. having a recipe and a block, both with name "wall" is fine, as they are different types).*/
     String getContentName();
+
+    /**Returns the localized name of this content.*/
+    String localizedName();
+
+    TextureRegion getContentIcon();
+
+    /**This should show all necessary info about this content in the specified table.*/
+    void displayInfo(Table table);
 }