feat: add tab list viewing system (#232)

src/main/java/minevalley/core/api/users/OnlineUser.java

@@ -13,6 +13,7 @@
 import minevalley.core.api.regions.utils.PlayerLocation;
 import minevalley.core.api.users.enums.FractionService;
 import minevalley.core.api.users.enums.McVersion;
+import minevalley.core.api.users.enums.TabListView;
 import minevalley.core.api.users.enums.TeamRank;
 import minevalley.core.api.utils.ChatHandler;
 import minevalley.core.api.utils.ClickableMessage;
@@ -114,6 +115,20 @@ public interface OnlineUser extends User {
 
     void sendActionBar(@NonNull String message);
 
+    /**
+     * Sends a tab-list view to this user.
+     *
+     * @param view   view to be sent
+     */
+    void sendTabListView(@NonNull TabListView view);
+
+    /**
+     * Gets the current tab-list view of this user.
+     *
+     * @return current tab-list view
+     */
+    TabListView getTabListView();
+
     /**
      * Sends a message to this user like the default player.sendMessage()-method. Without any prefix or color.
      *

src/main/java/minevalley/core/api/users/enums/TabListView.java

@@ -0,0 +1,12 @@
+package minevalley.core.api.users.enums;
+
+public enum TabListView {
+
+    DEFAULT,
+    DISPOSAL,
+    MAIL,
+    MEDIC,
+    POLICE,
+    TEAM,
+    SUPPORT
+}