Make functions invocation-directory and invocation-name obsolete

Make functions invocation-directory and invocation-name obsolete

* lisp/subr.el (invocation-directory, invocation-name):
Mark the function versions as obsolete.  (Bug#10476)
* lisp/startup.el (tty-handle-args):
* lisp/term/common-win.el (x-handle-xrm-switch, x-handle-name-switch):
* lisp/term/ns-win.el (top-level):
* lisp/term/pc-win.el (top-level):
* lisp/term/w32-win.el (window-system-initialization):
* lisp/term/x-win.el (top-level, x-handle-parent-id)
(x-handle-smid, window-system-initialization):
* test/lisp/htmlfontify-tests.el (htmlfontify-bug25468):
Use invocation-directory and invocation-name as variables.