fixed gadget hp properties and invincibility handling (#1773)

* fixed gadget hp properties and invincibility handling

* Allow killing of hp locked entities, if the damage is higher then the hp

Co-authored-by: hartie95 <mail@hartie95.de>

src/main/java/emu/grasscutter/data/binout/ConfigGadget.java

@@ -0,0 +1,15 @@
+package emu.grasscutter.data.binout;
+
+import lombok.AccessLevel;
+import lombok.Data;
+import lombok.experimental.FieldDefaults;
+
+import javax.annotation.Nullable;
+
+@Data
+@FieldDefaults(level = AccessLevel.PRIVATE)
+public class ConfigGadget {
+    // There are more values that can be added that might be useful in the json
+    @Nullable
+    ConfigGadgetCombat combat;
+}