Star Files can be manipulated outside Constellation while still open

[antares1470]

Prerequisites

• Put an X between the brackets on this line if you have done all of
  the following:

  • Running the latest version of Constellation

  • Attached the Support Package via Help >
    Support Package

  • Checked the FAQs:
    https://github.com/constellation-app/constellation/wiki/FAQ

  • Checked that your issue isn’t already filed:
    https://github.com/constellation-app/constellation/issues

  • Checked that there is not already a module that provides the
    described functionality:
    https://github.com/constellation-app/constellation/wiki/Catalogue-of-Repositories

Description

Star files while open in Constellation shouldn't be able to be edited externally. Instead, you can delete, rename and move files around without Constellation (or your OS) getting mad. In some cases, Constellation won't even pick up any issues unless you make changes within Constellation after the external manipulation has occurred (which in the case of deletion means you can inadvertently lose your graph).

While open, some sort of lock should be applied to the file (similar to what you see with files types for other applications) so that it can't be manipulated while the lock is on.

Steps to Reproduce

1. Create a basic graph and save it (keep graph open afterwards)
2. Open up your OS File explorer, navigate to where you saved the graph, and delete the file
3. File is deleted successfully (this shouldn't happen)
4. Close the graph in Constellation

Expected behaviour: Graph shouldn't be able to be deleted, renamed, etc. while in use

Actual behaviour: Graph can be altered externally, causing unexpected (and sometimes undesired) behaviour (in this case, the file is gone)

Reproduces how often: 100%

Additional Information

Any additional information, configuration or data that might be
necessary to reproduce the issue.