SPIGOT-5778: Added World.getGameTime method

By: Jakub Zacek <dawon.cz@gmail.com>

paper-api/src/main/java/org/bukkit/World.java

@@ -954,6 +954,15 @@ public interface World extends PluginMessageRecipient, Metadatable {
      */
     public void setFullTime(long time);
 
+    /**
+     * Gets the full in-game time on this world since the world generation
+     *
+     * @return The current absolute time since the world generation
+     * @see #getTime() Returns a relative time of this world
+     * @see #getFullTime() Returns an absolute time of this world
+     */
+    public long getGameTime();
+
     /**
      * Returns whether the world has an ongoing storm.
      *