[vim] Use a better whitespace plugin
[vim] Use a better whitespace plugin

- This one can be toggled on and off (useful when editing files by other
  people who left whitespace in so that some sanity remains when viewing
  them)
- Recommended as an alternative by the original plugin guy
  (https://github.com/bronson/vim-trailing-whitespace/blob/
  0c79bd5f94c0b798242ccefecfe1b853bfe98b2f/README)
- Modified leader mappings a little

spinningarrow/.files,spinningarrow/.files