Remove no longer needed Mixins (#1030)

src/main/java/carpet/fakes/CustomPayloadC2SPacketInterface.java

@@ -1,10 +0,0 @@
-package carpet.fakes;
-
-import net.minecraft.util.Identifier;
-import net.minecraft.network.PacketByteBuf;
-
-public interface CustomPayloadC2SPacketInterface
-{
-    Identifier getPacketChannel();
-    PacketByteBuf getPacketData();
-}

src/main/java/carpet/fakes/HungerManagerInterface.java

@@ -1,7 +0,0 @@
-package carpet.fakes;
-
-public interface HungerManagerInterface {
-    float getExhaustionCM();
-    void setExhaustionCM(float exhaust);
-    void setSaturationCM(float saturn);
-}

src/main/java/carpet/fakes/StatTypeInterface.java

@@ -1,6 +0,0 @@
-package carpet.fakes;
-
-public interface StatTypeInterface<T>
-{
-    boolean hasStatCreated(T key);
-}