Add missing copyright headers

Autoported commit.
Original commit hash: [bbf985a52]

itext.tests/itext.io.tests/itext/io/font/FontCacheTest.cs

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+/*
+This file is part of the iText (R) project.
+Copyright (c) 1998-2019 iText Group NV
+Authors: iText Software.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License version 3
+as published by the Free Software Foundation with the addition of the
+following permission added to Section 15 as permitted in Section 7(a):
+FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
+ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
+OF THIRD PARTY RIGHTS
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.
+See the GNU Affero General Public License for more details.
+You should have received a copy of the GNU Affero General Public License
+along with this program; if not, see http://www.gnu.org/licenses or write to
+the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+Boston, MA, 02110-1301 USA, or download the license from the following URL:
+http://itextpdf.com/terms-of-use/
+
+The interactive user interfaces in modified source and object code versions
+of this program must display Appropriate Legal Notices, as required under
+Section 5 of the GNU Affero General Public License.
+
+In accordance with Section 7(b) of the GNU Affero General Public License,
+a covered work must retain the producer line in every PDF that is created
+or manipulated using iText.
+
+You can be released from the requirements of the license by purchasing
+a commercial license. Buying such a license is mandatory as soon as you
+develop commercial activities involving the iText software without
+disclosing the source code of your own applications.
+These activities include: offering paid services to customers as an ASP,
+serving PDFs on the fly in a web application, shipping iText with a closed
+source product.
+
+For more information, please contact iText Software Corp. at this
+address: sales@itextpdf.com
+*/
 using System;
 using iText.IO.Font.Otf;
 using iText.Test;

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-c2b2e7f65cb8c55d184420181403551267812a16
+bbf985a52a74b5d78630e2de2d416093f4fed073