vimrc: Add window number to statusline

Thanks to "aegray" for asking how to jump to a specific window using
automatic numbers instead of using `<C-w>hjklw` on Freenode#vim. This
prompted me to look up `:h winnr()`, which I remember from a long time
ago, and learn that you can use the window numbers with `<C-w>w`, as in
`3<C-w>w`.

This will make it much easier to move around between my sometimes many
windows. In order to be able to tell which window has which number, add
the `winnr()` to the statusline.

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