This commit changes the normal-mode binding for `C` to `archive-copy-file` (which extracts, or copies, the file under cursor to the filesystem) from `archive-chown-entry` (which changes the file owner), and adds a new binding for the latter on `O`.
Understandably, `O` has a pre-existing meaning in Vi for normal mode, but is quite useless in `arc-mode`, since these buffers are declared read-only by default, and having them be read-write does nothing.
The intention behind this commit providing a straightforward way for file extraction to happen in `arc-mode` under Evil, a (presumably) common operation. Additionally, these new bindings now mirror those used in Emacs for `arc-mode`, as well as Emacs and Evil bindings for `tar-mode`; these improvements are likely worth the user-facing change made.
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