Deprecate old interfaces and util classes and reference new one

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

app/src/main/java/com/nextcloud/talk/models/database/ArbitraryStorage.java

@@ -27,6 +27,10 @@ import io.requery.Persistable;
 
 import java.io.Serializable;
 
+/**
+ * Legacy arbitrary storage entity, please migrate to {@link com.nextcloud.talk.data.storage.model.ArbitraryStorage}.
+ */
+@Deprecated
 @Entity
 public interface ArbitraryStorage extends Parcelable, Persistable, Serializable {
     @Key

app/src/main/java/com/nextcloud/talk/models/database/CapabilitiesUtil.java

@@ -34,7 +34,7 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
 /**
- * Deprecated, please use CapabilitiesNgUtil
+ * Deprecated, please migrate to {@link com.nextcloud.talk.utils.database.user.CapabilitiesUtilNew}.
  */
 @Deprecated
 public abstract class CapabilitiesUtil {

app/src/main/java/com/nextcloud/talk/models/database/User.java

@@ -30,6 +30,10 @@ import io.requery.Generated;
 import io.requery.Key;
 import io.requery.Persistable;
 
+/**
+ * Legacy user entity, please migrate to {@link com.nextcloud.talk.data.user.model.User}.
+ */
+@Deprecated
 @Entity
 public interface User extends Parcelable, Persistable, Serializable {
     String TAG = "UserEntity";