MNT-16381 Transformers must validate the content stream mimetype    - TransformerConfig.strictMimetypeCheck method added to perform check based on      transformer property transformer.strict.mimetype.check.whitelist
MNT-16381 Transformers must validate the content stream mimetype
   - TransformerConfig.strictMimetypeCheck method added to perform check based on
     transformer property transformer.strict.mimetype.check.whitelist

Alfresco/java-api-bck