Use version id in assets files

Is your feature request related to a problem? Please describe

When a new version is released, every user should empty his local cache to get the latest js/css assets. If a CDN is involved, CDN cached should also be emptied. This is painful. We don't like pain.

Describe the solution you'd like

js and css assets file name should change every time a new package is created, for instance "/assets/index-{substr(md5(CP_VERSION),-4)}.css"

Describe alternatives you've considered

No other idea.

Additional context

n/a