Add autoformat plugin and touch up some ftplugins
Remove 'if &filetype' guards from ftplugins -- at worst they prevent
ftplugin "chaining" (e.g. the liquid ftplugin sources the html ftplugin)
and at best they.... don't really do anything.
Improve man ftplugin tag search
Modify man ftplugin to use autoloads
This drastically reduces Vim's load time (the man ftplugin provided with
vim takes almost 100ms to load!)