Create 'l3d info' or 'l3d status' to provide helpful debugging output

It would be cool to have an 'l3d info' or 'l3d status' command to output the current used values and settings, and maybe to do some basic check if everything is setup properly.

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I think this is a great idea. I'd go for l3d info and it came to my mind that a user could actually call l3d on the host or (maybe accidentally) inside a l3d container. The latter would currently lead to an error because l3d doesn't exist inside a container. We can change/fix that by the same time and go for this:

If l3d info is called on the host, we run some analysis and output as much useful information we can possibly find. When this framework exists, it will be easy to add to this later on when we recognize more useful components.

For l3d info inside a container, we only output useful information for the current container. And while building that, if a user calls l3d inside the container with other arguments, then we can output a message, that this is only possible outside of the container.

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