[Feature request] see devices version/upgrade status from the admin page
**Is your feature request related to a problem? Please describe.**
Instead of going over the devices one by one, it'll be nice to have any kind of information on the devices version or if any firmware upgrade is available.
Also, it'll be good to know if a device must be upgraded to work with the current version of the plugin.

**Describe the solution you'd like**
Add the information to the devices admin page.