Rename --path to -C,--directory

[jkelling]

Maybe this option should be named more in line with established conventions.

I just did a quick survey and both make and poetry use -C, --directory for the CLI option with this semantics, so I suggest to use the same.

Originally posted by @jkelling in #181 (comment)

[poikilotherm]

This is related, a subset or even a duplicate of #137 and #179.

[led02]

Maybe this option should be named more in line with established conventions.

Where are these conventions defined? Why should we comply to them? Or is this simply a convention which is due to the set of tools you usually use?

Don't get me wrong: If there really is a common convention that holds for the majority of tools, we should follow it. However, I could not find a single reference to what flags should be named like (but only to how the syntax should be).