Implement !giveall command

-Also fixed server error when receiving characters

src/main/java/emu/nebula/data/resources/CharacterDef.java

@@ -12,6 +12,8 @@ import lombok.Getter;
 @ResourceType(name = "Character.json")
 public class CharacterDef extends BaseDef {
     private int Id;
+    private boolean Visible;
+    private boolean Available;
     private String Name;
     private int Grade;
     

src/main/java/emu/nebula/data/resources/DiscDef.java

@@ -8,6 +8,9 @@ import lombok.Getter;
 @ResourceType(name = "Disc.json")
 public class DiscDef extends BaseDef {
     private int Id;
+    private boolean Visible;
+    private boolean Available;
+    
     private int StrengthenGroupId;
     private int PromoteGroupId;
     private int TransformItemId;