Xpra: Ticket #2167: report javascript stacktraces to the server

Just like we do for the python client: unless the details of those exceptions are logged remotely, no-one is ever going to see anything.

Fri, 22 Feb 2019 08:09:18 GMT - Antoine Martin: status changed; resolution set

Done in r21793. As a bonus, we no longer assume that window.console exists, on IE it does not unless the javascript console is open..

Sat, 23 Jan 2021 05:43:59 GMT - migration script:

this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/2167