Clicking on to add an image should open up OS window

Issue found:

• If the user has created a column, which has the datatype: Image, the cell is just empty and it is not helpful

• Snapshot: 35
• OS: Mac OS/ M1

How to reproduce

1. Create a project
2. Open Model editor
3. Create a column with Image datatype
4. Click on one of the cells in the column, and it feels like entering in a string.

How it is expected to work

• If the data type is an image, clicking on the cell in the table should open up a OS dialog/file browse dialog to find the image.
• If the user uses an image already stored in the project, it will have a reference to it
• If the user chooses something else in the hard drive, it will be copied over to the project content/images folder and referenced from there. Like this:

OSdialogShouldOpenFromImageCell.png