Add support for lexical variables to the debugger's `e' command.

* lisp/emacs-lisp/debug.el (debug): Don't let-bind the debugger-outer-*
vars, except for debugger-outer-match-data.
(debugger-frame-number): Move check for "on a function call" from
callers into it.  Add `skip-base' argument.
(debugger-frame, debugger-frame-clear): Simplify accordingly.
(debugger-env-macro): Only reset the state stored in non-variables,
i.e. current-buffer and match-data.
(debugger-eval-expression): Rewrite using backtrace-eval.
* lisp/subr.el (internal--called-interactively-p--get-frame): Remove.
(called-interactively-p):
* lisp/emacs-lisp/edebug.el (edebug--called-interactively-skip): Use the new
`base' arg of backtrace-frame instead.
* src/eval.c (set_specpdl_old_value): New function.
(unbind_to): Minor simplification.
(get_backtrace_frame): New function.
(Fbacktrace_frame): Use it.  Add `base' argument.
(backtrace_eval_unrewind, Fbacktrace_eval): New functions.
(syms_of_eval): Export backtrace-eval.
* src/xterm.c (x_focus_changed): Simplify.

lisp/emacs-lisp/edebug.el

@@ -4268,7 +4268,7 @@ With prefix argument, make it a temporary breakpoint."
              (eq (nth 1 (nth 1 frame1)) '())
              (eq (nth 1 frame2) 'edebug-enter))
     ;; `edebug-enter' calls itself on its first invocation.
-    (if (eq (nth 1 (internal--called-interactively-p--get-frame i))
+    (if (eq (nth 1 (backtrace-frame i 'called-interactively-p))
             'edebug-enter)
         2 1)))