Easier to edit .vimrc
Make tasks cross platform
Various convenience stuff
jk is better than jj for escape.

Also map <esc> to <nop> to force myself to start using it
Don't accumulate autocmds
Removed stuff I don't use
Tidy up vimrc

Move related stuff together, group by marks.

No actual changes, except
    autocmd! FileType vim set foldmethod=marker
Group plugins
Don't use abbreviated forms in vimrc