Add CEF license to CEF feature

We should include the CEF License in the unpacked archive as it may also be used in other applications.

ci/Jenkinsfile.cef

@@ -18,7 +18,7 @@ pipeline {
           {
             // Download CEF distribution
             downloadCEF versionFile: '../../../../CEF_VERSION.txt',
-              files: ['Resources'],
+              files: ['Resources', 'LICENSE.txt'],
               wildcards: [
                 'Release/*.dll',
                 'Release/*.bin'