We don't need ":wa" really, especially since we have our autowriteall
(not to mention the autocmd BufLeave)
New keys to traverse windows!

Finally figured out why <C-i> wasn't working. Turns out <Tab> is some
sort of alias on <C-i>. So, switching windows uses <C-Tab> & <C-S-Tab>
while <S-Tab> has been mapped to <C-o> as a complement to <Tab>.