New Project menu pick is disabled after finishing project creation

[skyler-rs]

Describe the bug
After finishing the new project wizard, the "New Project" menu pick is disabled until app restart.

To Reproduce
Steps to reproduce the behavior:

1. Click File > New Project
2. Click through the creation steps and click finish
3. Click File
4. Note that "New Project" is no longer selectable
   

Expected behavior
The menu pick shouldn't be disabled and the user should be able to re-run the New Project wizard, creating and loading the new project. (Note, just from observing it's state when opening/closing it mid use, it looks like this might be one dialog instance so re-running the project wizard might take some refactoring.

[skyler-rs]

Initial gui task for Zaryab once he starts working in the code

[skyler-rs]

Note: This might be a dupe of #218

[KochynVolodymyr]

This is actually done. After project being closed - new project become available.

[skyler-rs]

Ah I see. Should the "New Project" menu pick be disabled any time a project is loaded then? For example if you click Open Project or execute "create_design foo"?

[KochynVolodymyr]

I guess so

[skyler-rs]

Gotcha, i'll close this for now as I'm not sure the additional logic would really add much usability-wise and probably isn't a good starting task for Zaryab.