Asynchronous workspace connection process

The GUI should send a “signal” to request a workspace connection
and e.g. poll to know about the currently connected workspaces.

This way, a connection timeout can be easily implemented and connection
feedback problems are avoided.

(from redmine: issue id 1618, created on 2014-03-30 by root, closed on 2014-09-28)

• Relations:
  • child #1600
• Changesets:
  • Revision 1468 by Marcel Rieger on 2014-09-28T12:05:12Z:

Major refactoring of Workspaces, everything async now, fix #1600, fix #1618.

• Revision 1468 by Marcel Rieger on 2014-09-28T12:05:12Z:

Major refactoring of Workspaces, everything async now, fix #1600, fix #1618.