BUG 0000 "Safe upgrade for JavaScript files" SOLVED

- New feature
- Safe upgrade for JavaScript files
- Added new feature,
- This new feature is activated when you run one of the following commands:
    $ ./processmaker upgrade
    $ ./processmaker build-js
    $ ./processmaker browser-cache-files-upgrade
- The new feature creates an attribute in the file "processmaker/workflow/engine/config/env.ini"
    Example:
    browser_cache_files_uid = "xxxxxxxxxxyyyyyyyyyyzzzzzzzzzzaa"
- After running the command, the browser should automatically cache the new files
* Available from version ProcessMaker-2.5