Fix loading .xinitrc-details
Update submodules

Note that UltiSnips was _not_ updated to the latest version. These warnings pop
up every time one tries to tab complete comething with YouCompleteMe and can be
very frustrating. The solution is to fix YCM to stop using deprecated
functions, but this will have to do for now.
Avoid 'Hit ENTER to continue' prompts in Vim

Note that this does not prevent warning or error status messages from showing.