Version 2.0.0 rc4

• Fix a race condition when handling error at project opening
• Fix an issue with editing network on windows
• Fix windows tests
• Catch timeout error on docker
• typing is already included in Py >= 3.5 (#979)
• Fix import of some old topologies
• Fix AttributeError: 'NoneType' object has no attribute 'returncode'
• Fix ghost vmware vms
• Fix required field in schema not use
• Catch error and log them when we can't write the config
• Fix bridge 'bridge0' already exist when we have trouble with a container
• Catch an error at startup when the remote GNS3 VM is not a real GNS3 VM
• Fixes Qemu sata option. Ref #875.
• Catch GNS3 VM loading error at startup