#719: Add Player Profile API

Slight changes may occur as this API is stabilized.

This PR is based on work previously done by DerFrZocker in #663.

By: blablubbabc <lukas@wirsindwir.de>

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

@@ -6,6 +6,7 @@ import org.bukkit.entity.AnimalTamer;
 import org.bukkit.entity.EntityType;
 import org.bukkit.entity.Player;
 import org.bukkit.permissions.ServerOperator;
+import org.bukkit.profile.PlayerProfile;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -39,6 +40,18 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
     @NotNull
     public UUID getUniqueId();
 
+    /**
+     * Gets a copy of the player's profile.
+     * <p>
+     * If the player is online, the returned profile will be complete.
+     * Otherwise, only the unique id is guaranteed to be present. You can use
+     * {@link PlayerProfile#update()} to complete the returned profile.
+     *
+     * @return the player's profile
+     */
+    @NotNull
+    PlayerProfile getPlayerProfile();
+
     /**
      * Checks if this player is banned or not
      *