[winswitch] migration to github

[Antoine Martin]

Hi,

The xpra project has been migrated to github.
You can now find all the repositories here:
https://github.com/Xpra-org

We're hoping that this will make it easier to use and navigate.
It should also be easier to manage issues, submit and review code changes.

The xpra documentation has been updated, curated, and split into two:
* the documentation which is specific to a version is now part of the
source tree and it is included with all the binary packages in HTML form
https://github.com/Xpra-org/xpra/tree/master/docs
* the information that changes over time will remain on the new wiki:
https://github.com/Xpra-org/xpra/wiki

The HTML5 client has been split into a separate repository:
https://github.com/Xpra-org/xpra-html5
And its release cadence may well end up being different than that of the
main project.

The source snapshots and binary packages will remain at:
https://xpra.org/src/
https://xpra.org/dists/

Cheers,
Antoine