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

doc/licenses/jcommander/NOTICE

@@ -2,7 +2,9 @@
 # URL:     https://jcommander.org/
 # From:    'Cédric Beust' (https://github.com/cbeust)
 # License: Apache v2.0
+# Source:  https://raw.githubusercontent.com/cbeust/jcommander/refs/tags/${VERSION}/notice.md
+# Source:  https://raw.githubusercontent.com/cbeust/jcommander/refs/tags/jcommander-${VERSION}/notice.md
 #
-# --- BEGIN LICENSE FILE ---
+# --- BEGIN LICENSE FILE [1.82] ---
 Copyright 2010 Cedric Beust <cedric@beust.com>
-# --- END LICENSE FILE ---
+# --- END LICENSE FILE [1.82] ---