Display Godot version and last edited timestamp in project manager

[kitbdev]

• closes Display the godot version instead of a warning sign in the project manager godot-proposals#9384

Shows the project version and the last edited timestamp for each project.
The version has the same tooltip as the unsupported features icon.

If the project major version is the same and the minor version is before the current version, do not show warning. (godotengine/godot-proposals#9384 (comment))
I couldn't check patches, since they aren't stored.

Adds a warning for projects edited in 3.x (config version 4). They didn't have one before since they don't have supported features.
Also adds a warning for config versions before 4 of "Unknown version".

[JekSun97]

This is what has been missing for so long! Thank you!

[Calinou]

Tested locally (rebased on top of master 2149682), it works as expected.

UI looks good to me. We could perhaps colorize version numbers later (use the warning color if different than the current version), but this should suffice for now.

Before	After

On projects with a warning (due to requiring conversion or being C# projects in a non-C# build), the warning icon is displayed like this:

[akien-mga]

Looks good overall, let's give it a spin.

I think the timestamp takes a lot of space and in the provided screenshots, tend to overlap/cut into the project path. We might want to look into options to make it less intrusive (e.g. only include the date and not the time, or include the time only for things which are at most a week old, and remove seconds anyway, etc.).

[akien-mga]

Thanks!