Removed included files from 'complete' option

It takes longer than I find it's worth
Removed lawrencium
Removed bufexplorer
Removed nerdtree
Cleaned up some mappings in vimrc
Moved g:c_no_comment_fold into the "look" vimrc fold
Changed completeopt to just "menu" - seems snappier
Added <silent> to window moving mappings in vimrc