Replaced Spectate Selection GUI with Player Overview GUI, added way to hide specific players

Updated Skin File retrieving to new Mojang API

IMPORTANT: clean and rebuild the IntelliJ project, Access Transformers added!

src/main/java/eu/crushedpixel/replaymod/registry/PlayerHandler.java

@@ -0,0 +1,67 @@
+package eu.crushedpixel.replaymod.registry;
+
+import com.google.common.base.Predicate;
+import eu.crushedpixel.replaymod.entities.CameraEntity;
+import eu.crushedpixel.replaymod.gui.GuiPlayerOverview;
+import eu.crushedpixel.replaymod.replay.ReplayHandler;
+import net.minecraft.client.Minecraft;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.player.EntityPlayer;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class PlayerHandler {
+
+    private static Minecraft mc = Minecraft.getMinecraft();
+
+    private static Predicate<EntityPlayer> playerPredicate = new Predicate<EntityPlayer>() {
+        @Override
+        public boolean apply(EntityPlayer input) {
+            if(input instanceof CameraEntity || input == mc.thePlayer) return false;
+            return true;
+        }
+    };
+
+    private static List<Integer> hidden = new ArrayList<Integer>();
+
+    public static void hidePlayer(EntityPlayer player) {
+        hidden.remove((Integer) player.getEntityId());
+        hidden.add(player.getEntityId());
+    }
+
+    public static void showPlayer(EntityPlayer player) {
+        hidden.remove((Integer) player.getEntityId());
+    }
+
+    public static void setIsVisible(EntityPlayer player, boolean visible) {
+        if(visible) showPlayer(player);
+        else hidePlayer(player);
+    }
+
+    public static List<Integer> getHiddenPlayers() {
+        return hidden;
+    }
+
+    public static boolean isHidden(int id) {
+        return hidden.contains(id);
+    }
+
+    public static void resetHiddenPlayers() {
+        for(int i : hidden) {
+            Entity ent = mc.theWorld.getEntityByID(i);
+            if(ent != null) {
+                ent.setInvisible(false);
+            }
+        }
+    }
+
+    public static void openPlayerOverview() {
+        if(!ReplayHandler.isInReplay()) {
+            return;
+        }
+
+        List<EntityPlayer> players = mc.theWorld.getEntities(EntityPlayer.class, playerPredicate);
+        mc.displayGuiScreen(new GuiPlayerOverview(players));
+    }
+}