SPIGOT-7300, #829: Add new DamageSource API providing enhanced information about entity damage

By: Doc <nachito94@msn.com>
Also-by: 2008Choco <hawkeboyz2@hotmail.com>

paper-api/src/main/java/org/bukkit/damage/DamageScaling.java

@@ -0,0 +1,26 @@
+package org.bukkit.damage;
+
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.ApiStatus;
+
+/**
+ * A means of damage scaling with respect to the server's difficulty.
+ */
+@ApiStatus.Experimental
+public enum DamageScaling {
+
+    /**
+     * Damage is not scaled.
+     */
+    NEVER,
+    /**
+     * Damage is scaled only when the
+     * {@link DamageSource#getCausingEntity() causing entity} is not a
+     * {@link Player}.
+     */
+    WHEN_CAUSED_BY_LIVING_NON_PLAYER,
+    /**
+     * Damage is always scaled.
+     */
+    ALWAYS;
+}