Add UNSAFE util.

src/main/scala/io/izzel/taboolib/util/UNSAFE.java

@@ -1,7 +1,6 @@
 package io.izzel.taboolib.util;
 
 import sun.misc.Unsafe;
-import sun.reflect.CallerSensitive;
 
 import java.lang.reflect.Field;
 import java.security.ProtectionDomain;
@@ -20,11 +19,6 @@ public class UNSAFE {
         }
     }
 
-    @CallerSensitive
-    public static Unsafe getUnsafe() {
-        return Unsafe.getUnsafe();
-    }
-
     public static int getInt(Object o, long offset) {
         return unsafe.getInt(o, offset);
     }