This allows you to set REACT_EDITOR to 'vim --remote', so the file can
be opened in an already running vim process. When using vim without
remote, it works in the same way as before.

When launching vim without --remote, the order of the line and path
arguments doesn't matter. However, when using --remote the line argument
has to precede the path. This happens to be the same as joe and emacs
uses, so the vim cases were just moved there.

I haven't tested this with mvim, but the documentation says the same as
the vim documentation, so I assume it works the same.