Allow creating, saving as and loading json files

[Shadowblitz16]

Can we have the ability to..

• create new json files in the filesystem
• save json files under a different name
• load json files if one is already open
• create new json objects if a json file is not open and save them later

[hnOsmium0001]

For the first one, as far as I know there is no way to add intregration in the FileSystem panel. I haven't looked into whether there is a feature request in the engine itself yet.

[Shadowblitz16]

@hnOsmium0001 you could do something like this.. https://godotengine.org/asset-library/asset/313