Adding metadata view

[CorradoMotta]

issue:

From the interface, it should be possible to fill the global metadata and generate a .ini file. The metadata view should be accessible only when Swamp is disconnected.

Steps:

• [x] Create a view that is displayed instead of the main view and covers the whole application window.
• [x] Populate the view with fields for each mandatory metadata.
• [x] Create C++ backend.
• [x] Save the data as .ini format.

Additional features to cover in another task when this is completed:

• Check against the JSON database
• Auto-fill variables whenever possible
• Add the optional variables page as a stack view

[CorradoMotta]

Global metadata that can be automatically calculated are NOT added to the interface, but should instead be added in the python scripts for better accuracy.

[CorradoMotta]

Cpp backend added. The global metadata attributes are now added to the constructor of the Cpp class and automatically loaded into the interface. In the future, such data will be directly loaded from the JSON database instead.

[CorradoMotta]

Further improvements before closing this ticket:

• Sorting the global metadata in a meaningful way
• Adding description when hovering on an info icon

[CorradoMotta]

All done. readme section should be updated as well