Add tmux config for starting windows/panes at 1

[alpha0mega96]

Hey, I just found this:

# Start windows and panes at 1, not 0
set -g base-index 1
setw -g pane-base-index 1

Source: https://unix.stackexchange.com/a/35932

Could this be made standard in this?
I'd like to just patch that in.

[alpha0mega96]

tmux-patch.txt

This is the quick patch I made, if you could patch it in, it'd be great!

[hholst80]

What do you think about having this as a separate plugin instead? It is a bit controversial to have as a "sensible default" but having it as plugin would enable it with a single line in your tmuxrc?

[DJCrashdummy]

this is a duplicate of #33