Update submodules
vim: Add Tabular plugin
vim: Fix some issues with recent mappings

- The vimple bug got fixed
- Turned out that overloading <cr> sucks, because it conflicts with some
  other usages (e.g. quickfix, csv.vim)
- Turned out that `setf vim` sucked when sourcing a script that includes
  manipulates windows (e.g. `wincmd h`)