Remove rxvt tweaks

I don't think I ever actually needed these fixes, but had inherited them
from someone else's configs a long time ago. Remove them.
Move custom commands into commands directory
Add ToggleList function to helpers

This is useful for toggling the display of the quickfix and location
list buffers used by various plugins, specifically Syntastic at this
point in time.
Merge motion.vim and window.vim
Reorganize config files

These started to be split up a little _too_ aggressively. Recombine them
to lower the file count and reduce the number of files we need to
search.

This makes the `config` directory much less intimidating.