Provide network and SSL errors for the AssetDownloader

Asset downloader should provide network and SSL errors to give more detailed information about the network problems.

Known issues that need more detailed info.

Good practise is to show the basic info and then have a "read more..." link at the end. The link will reveal more information based on the HTTP error code:

1. SSL , we know that the SSL handshake failed. There can be number of reasons for this it can be invalid certificate fron the resource OR it can also be man-in-the-middle attack
2. Blocked, firewall or something is blocking it. Do we see the HTTP response code ? 509 ?
3. Destination unreachable, network is just down, even the primary router endpoint cannot be reached

there might be other common cases too , need to be checked but this is the minimum list.