Squashed 'syntax/' changes from f227351..e1645a4

e1645a4 make vaxe hss-aware
bcf3c69 add using to keywords
29b9fdd get rid of reference to help, it will not be present in all plugins
6b83d75 add hxml from old vaxe syntax

git-subtree-dir: syntax
git-subtree-split: e1645a49ce69d019ab0726507934caa0dde55bb2
Merge commit '6561c470b021738b55b1b956efd1176ec5673cfd'