Revert deletion of NmsManager, deprecate it and have it use the new one

Core/src/main/java/com/songoda/core/nms/NmsManager.java

@@ -0,0 +1,53 @@
+package com.songoda.core.nms;
+
+import com.songoda.core.nms.anvil.AnvilCore;
+import com.songoda.core.nms.entity.NMSPlayer;
+import com.songoda.core.nms.nbt.NBTCore;
+import com.songoda.core.nms.world.NmsWorldBorder;
+import com.songoda.core.nms.world.WorldCore;
+
+/**
+ * @deprecated Use {@link Nms} instead.
+ */
+@Deprecated
+public class NmsManager {
+    @Deprecated
+    public static NMSPlayer getPlayer() {
+        return Nms.getImplementations().getPlayer();
+    }
+
+    @Deprecated
+    public static AnvilCore getAnvil() {
+        return Nms.getImplementations().getAnvil();
+    }
+
+    @Deprecated
+    public static boolean hasAnvil() {
+        return getAnvil() != null;
+    }
+
+    @Deprecated
+    public static NBTCore getNbt() {
+        return Nms.getImplementations().getNbt();
+    }
+
+    @Deprecated
+    public static boolean hasNbt() {
+        return getNbt() != null;
+    }
+
+    @Deprecated
+    public static WorldCore getWorld() {
+        return Nms.getImplementations().getWorld();
+    }
+
+    @Deprecated
+    public static boolean hasWorld() {
+        return getWorld() != null;
+    }
+
+    @Deprecated
+    public static NmsWorldBorder getWorldBorder() {
+        return Nms.getImplementations().getWorldBorder();
+    }
+}