vim: switch to vundle from pathogen

Removed all submodules, disabled most plugins in vimrc.
vim: align plugin names, remove pathogen code + colors
vim: workaround coward :helptags not ignoring wildignore

At last! I had :helptags giving the error "not a directory" for a long
time. At least it gave me the opportunity to look inside pathogen and
vundler for clues.
vim: no default Global for replace, colorscheme

Switched to gruvbox instead of solarized.