Implement a new item drops system (#2112)

* 1

* Delete .gitattributes

* implement

* Update PacketDropHintNotify.java

* Update PacketWorldChestOpenNotify.java

* Update FileUtils.java

* Update PacketDropHintNotify.java

* Update WorldDataSystem.java

---------

Co-authored-by: Magix <27646710+KingRainbow44@users.noreply.github.com>

src/main/java/emu/grasscutter/data/excels/DropMaterialData.java

@@ -0,0 +1,18 @@
+package emu.grasscutter.data.excels;
+
+import emu.grasscutter.data.GameResource;
+import emu.grasscutter.data.ResourceType;
+import lombok.Getter;
+
+@ResourceType(name = "DropMaterialExcelConfigData.json")
+@Getter
+public class DropMaterialData extends GameResource {
+    @Getter(onMethod_ = @Override)
+    private int id;
+    private boolean useOnGain;
+    private boolean disableFirstGainHint;
+    private boolean autoPick;
+    private boolean dropSeparately;
+    private int groupId;
+    private boolean forceGainHint;
+}

src/main/java/emu/grasscutter/data/excels/DropTableData.java

@@ -0,0 +1,25 @@
+package emu.grasscutter.data.excels;
+
+import emu.grasscutter.data.GameResource;
+import emu.grasscutter.data.ResourceType;
+import emu.grasscutter.data.ResourceType.LoadPriority;
+import emu.grasscutter.data.common.DropItemData;
+import lombok.Getter;
+
+import java.util.List;
+
+@ResourceType(name ={"DropTableExcelConfigData.json","DropSubTableExcelConfigData.json"} , loadPriority = LoadPriority.HIGH)
+@Getter
+public class DropTableData extends GameResource {
+    @Getter(onMethod_ = @Override)
+    private int id;
+    private int randomType;
+    private int dropLevel;
+    private List<DropItemData> dropVec;
+    private int nodeType;
+    private boolean fallToGround;
+    private int sourceType;
+    private int everydayLimit;
+    private int historyLimit;
+    private int activityLimit;
+}