[feature request] preview on file click

# preview is useful

Most of the time while browsing file I don't need to open them in app, I just want to see what's inside.

# easier file selection

I understand the concept of elementary where everything is one click, however in a file manager it makes it hard to select files, because in pantheon-files one click just opens the file in whatever application (except if `ctrl` is pressed).

I think a good compromise (between people like me used to double-click to open) would be to show a preview right inside pantheon-files on click (no dialog/pop-up like in nautilus with gnome-sushi), similar to what windows explorer (preview pane) and finder are doing (in some mode).

# consistent behavior

In columns view (millers view) it is also more consistent as click on a folder result in displaying its contents on the right, thus click on a file should display its content on the right also in my opinion (inside a preview column).

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