Deprecate the ClassMapping and MethodMapping classes

They are a huge pain to maintain... I should have put a stronger word against this when it got added...

Compatibility/src/main/java/com/songoda/core/compatibility/ClassMapping.java

@@ -1,5 +1,9 @@
 package com.songoda.core.compatibility;
 
+/**
+ * @deprecated Usage is highly discouraged – use NMSManager instead
+ */
+@Deprecated
 public enum ClassMapping {
     BIOME_BASE("world.level.biome", "BiomeBase"),
     BIOME_STORAGE("world.level.chunk", "BiomeStorage"),

Compatibility/src/main/java/com/songoda/core/compatibility/MethodMapping.java

@@ -5,6 +5,10 @@ import org.bukkit.inventory.ItemStack;
 
 import java.lang.reflect.Method;
 
+/**
+ * @deprecated Usage is highly discouraged – use NMSManager instead
+ */
+@Deprecated
 public enum MethodMapping {
     MC_ITEM_STACK__GET_TAG("getTag", "getTag", "s", "t", "u"),
     MC_ITEM_STACK__SET_TAG("setTag", "setTag", "c", "c", "c", ClassMapping.NBT_TAG_COMPOUND.getClazz()),