GUACAMOLE-2139: Add automatic retrieval of license information where absent. Remove unused license info.

doc/licenses/logback/LICENSE.txt

@@ -2,8 +2,11 @@
 # URL:     http://logback.qos.ch/
 # From:    'QOS.ch Sàrl' (http://qos.ch/)
 # License: EPL v1.0 
+# Source:  https://raw.githubusercontent.com/qos-ch/logback/refs/tags/v_${VERSION}/LICENSE.txt
 #
-# --- BEGIN LICENSE FILE ---
+# +: ** ECLIPSE PUBLIC LICENSE v1.0 CHOSEN. **
+#
+# --- BEGIN LICENSE FILE [1.3.15] ---
 Logback LICENSE
 ---------------
 
@@ -18,6 +21,4 @@ the Eclipse Foundation
  
 under the terms of the GNU Lesser General Public License version 2.1
 as published by the Free Software Foundation.
-
-** ECLIPSE PUBLIC LICENSE v1.0 CHOSEN. **
-# --- END LICENSE FILE ---
+# --- END LICENSE FILE [1.3.15] ---