Fix inconsistencies with opening files

[antares1470]

Prerequisites

• [x] 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

Across Constellation, there are different dialog boxes that are presented when wanting to open a file. Some use the native OS while others use a custom Constellation dialog box. This should be fixed such that it is consistent across the application.

Steps to Reproduce

1. Open Constellation
2. Go File > Open
3. Observe the dialog box
4. Open the File Importer
5. Click the + button to load a file
6. Observe the dialog box

Expected behaviour: Dialog box used should be the same

Actual behaviour: One uses a constellation dialog and the other uses the local OS dialog

Reproduces how often: 100%

Additional Information

Given you get the Constellation dialog when going File > Open, I suspect it is a native Netbeans one. I do think it looks slightly nicer either way so I think using that dialog is the way to go