Gns3-gui

* Fix KeyError: 'spice+agent'. Fixes 2890
* Fix wrong log.error() call when exporting file.
* Revert "Explicitly cleanup the cache directory."
* Fix "UnboundLocalError: local variable 'pywintypes' referenced before assignment"
* Fix GUI uses only telnet console. Fixes 2885
* Fix missing sys module in sudo.py Fixes 2886

* Check if console_type is None.
* Explicitly cleanup the cache directory.
* Get Windows interface from registry if cannot load win32com module.
* Ignore OSError returned by psutil when bringing console to front.
* Catch error if NPF or NPCAP service cannot be detected. Ref https://github.com/GNS3/gns3-server/issues/1670
* Better handling for reading synchronous JSON response from server. Ref 2874
* Fix JSONDecodeError when getting server version. Fixes 2874
* Fix FileNotFoundError exceptions when launching SPICE or VNC clients.
* Fix UnboundLocalError local variable 'win32serviceutil' referenced before assignment
* 'Fix' tab order in preferences dialog so it follows the layout
* 'Fix' tab order in edit project dialog so it follows the layout
* Use compatible shlex_quote to handle case where Windows needs double quotes around file names, not single quotes. Ref https://github.com/GNS3/gns3-gui/issues/2866
* Use 0.0.0.0 by default for server host. Fixes https://github.com/GNS3/gns3-server/issues/1663
* Catch IndexError when configuring port names. Fixes 2865

* No changes

* Adjust size for setup dialog and remove question about running the wizard again. Ref 2846

* Fix issue when asking to run the setup wizard again. Ref 2846
* Remove warning about VirtualBox not supporting nested virtualization. Ref https://github.com/GNS3/gns3-server/issues/1610
* Ask user if they want to see the wizard again. Ref 2846

* Revert to jsonschema 2.6.0 due to packaging problem.