aggregate-download-licenses: downloaded license texts from WWW or locally fetched ones are missing their file extensions

[duracotton]

I have set the "licensesConfigFile"'s URL element to use some WWW Urls as well as some local files (using the file:// descriptor - see #428)

Result of a mvn clean package in the "licensesOutputDirectory ":

• For the local license texts defined with the file:// descriptor: the original extensions (.html and .txt) of all files are removed
  

  license-maven-plugin/src/main/java/org/codehaus/mojo/license/download/LicenseDownloader.java

  Line 187 in 3f66788

  Files.copy( in, outputFile.toPath() );

  
  No extension is set explicitly or taken from the input file.

• For the downloaded license texts: some files have an extension but most of them are missing them.

Result screenshot: