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/renderer/InvisibilityRender.java

@@ -0,0 +1,24 @@
+package eu.crushedpixel.replaymod.renderer;
+
+import eu.crushedpixel.replaymod.registry.PlayerHandler;
+import net.minecraft.client.renderer.culling.ICamera;
+import net.minecraft.client.renderer.entity.RenderManager;
+import net.minecraft.client.renderer.entity.RenderPlayer;
+import net.minecraft.entity.Entity;
+
+public class InvisibilityRender extends RenderPlayer {
+
+    public InvisibilityRender(RenderManager renderManager) {
+        super(renderManager);
+    }
+
+    public InvisibilityRender(RenderManager renderManager, boolean useSmallArms) {
+        super(renderManager, useSmallArms);
+    }
+
+    @Override
+    public boolean shouldRender(Entity entity, ICamera camera, double camX, double camY, double camZ) {
+        if(PlayerHandler.isHidden(entity.getEntityId())) return false;
+        return super.shouldRender(entity, camera, camX, camY, camZ);
+    }
+}