(normal-mode): Move call to hack-project-variables into

(normal-mode): Move call to hack-project-variables into
hack-local-variables.
(file-local-variables-alist, before-hack-local-variables-hook):
New vars.
(ignored-local-variables): Add file-local-variables-alist.
(hack-local-variables-filter): Renamed from
hack-local-variables-apply.  Add the result to
file-local-variables-alist, without applying them.
(hack-local-variables): Set file-local-variables-alist to nil.
Call hack-project-variables and before-hack-local-variables-hook.
Apply variables here, instead of hack-local-variables-apply.
Based on a patch by Alan Mackenzie.