File source path needs to be displayed

[cwhanse]

obeditor opens (by default) the .json files found in Downloads (?) actually I don't know. A developer is likely to have several versions of e.g. Master-OB-OpenAPI.json in different folders, or, different versions of one file managed via git. If obeditor is closed then re-opened, the default file is not likely to be where the developer was last working. It would be a real advantage to developers if the file path for the opened .json files is shown somewhere.