Refactor EntityDamageEvents. Adds BUKKIT-1944 & BUKKIT-3684

By: feildmaster <admin@feildmaster.com>

paper-server/src/main/java/org/bukkit/craftbukkit/util/CraftDamageSource.java

@@ -0,0 +1,31 @@
+package org.bukkit.craftbukkit.util;
+
+import net.minecraft.server.DamageSource;
+
+// Util class to create custom DamageSources.
+public final class CraftDamageSource extends DamageSource {
+    public static DamageSource copyOf(final DamageSource original) {
+        CraftDamageSource newSource = new CraftDamageSource(original.translationIndex);
+
+        // Check ignoresArmor
+        if (original.ignoresArmor()) {
+            newSource.j();
+        }
+
+        // Check magic
+        if (original.q()) {
+            newSource.r();
+        }
+
+        // Check fire
+        if (original.c()) {
+            newSource.l();
+        }
+
+        return newSource;
+    }
+
+    private CraftDamageSource(String identifier) {
+        super(identifier);
+    }
+}