[Toybox] ls implementation

[Andre Renaud]

Hi Rob,

>> I've added a couple of bits to it, so that it supports ls -lFa1. The
>> main thing missing is support for files in the command line (currently
>> it only supports directories).
> 
> And -R support.

Attached is a patch that adds support for having files on the command
line (as well as directories), and -R support. There are two drawbacks
to it however:

The files on the command line always get treated as separate items, so
they always appear one per line, even if -1 hasn't been specified.

To support -R I've done the trivial recursive implementation, but
because I need a string for the next directory name, it has pretty
massive stack usage (PATH_MAX * depth).

Both of these issues would be resolved by maintaining some kind of
growing list of entries to be written to, which could be re-purposed as
they're printed, however the structure I implemented initially doesn't
extend to that trivially.

For now, I think this is relatively usable & simple, if not particularly
optimal.

Regards,
Andre

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