Django

Describe the feature you'd like
Having support to open content (video/audio) at a specific timestamp would be very useful. Ideally this feature is supported across all existing features such as sharing and in comments.

One could imagine this could be extended with a page for PDF's.

Describe alternatives you've considered
There are no alternatives available.

**Additional contex

While I'm on the security side; it is possible to post dweets that, while maybe not a real security threat, can really affect the flow of the website by throwing exceptions with interesting strings. For instance hundreds of newlines.

One way to solve it is to deal with those specific instances, ie. don't allow it to grow with newlines etc.

But I suggest we simply disable the viewing of error

Use OpenwispCeleryTask as base class for following tasks of openwisp-controller:

• openwisp_controller.config.tasks.invalidate_devicegroup_cache_change
• openwisp_controller.config.tasks.invalidate_devicegroup_cache_delete
• openwisp_controller.connection.tasks.update_config
• openwisp_controller.subnet_divis