[PATCH] Support for :file command

[Sanel Zukan]

Hi all,

In attachment is a patch to support correct ':file' command, that
should provide basic information about file. Current implementation in
Evil is alias to ':files', which will incorrectly display available
buffers.

I tried to match Vim's output as much as possible. Also, I'm not sure
does Evil already provides some facilities for querying file
informations so I used Emacs api. Feel free to adjust it :)

Please let me know if something breaks.

PS: should I fill issue for this request?

Regards,
Sanel
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