Improved resource information for external libraries
- added vulnerability check for a particular version - centralized URL generation for cdnjs URLS (will reduce maintenance work, when external URL changes) - improve behavior when running without an Internet connection
Extended resource info dict with explicit version number and an API call to obtain the newest version number
The two new optional resource info fields are - versionCheckAPI - installedVersion These fields are necessary to provide an admin page to check whether the installed versions are the most recent ones.