Migrate Carpet Mixin names to mojang mappings

src/main/java/carpet/mixins/PlayerTabOverlayMixin.java

@@ -0,0 +1,19 @@
+package carpet.mixins;
+import carpet.fakes.PlayerListHudInterface;
+import net.minecraft.client.gui.components.PlayerTabOverlay;
+import net.minecraft.network.chat.Component;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+
+@Mixin(PlayerTabOverlay.class)
+public abstract class PlayerTabOverlayMixin implements PlayerListHudInterface
+{
+    @Shadow private Component footer;
+
+    @Shadow private Component header;
+
+    public boolean hasFooterOrHeader()
+    {
+        return footer != null || header != null;
+    }
+}