Set expandtab and textwidth for all file types

I was tired of having to manually use spaces for file types that I don't
normally use (such as XML files, for instance, or something like that).
Prevent rendering large files/lines

Vim has a hard time rendering large files/lines, and it mainly has to do
with syntax highlighting. I don't have to color the entire file to see
it.
Add support for snippets via UltiSnips