Refactor quiet! to be less destructive

It's possible for the debugger to be invoked from inside code wrapped in
a (quiet! ...) call. The debugger pauses Emacs in a broken state where
the functions locally rebound by quiet! (e.g. message, load-file,
write-region, etc) are never returned to their original definitions.

This attempts to reduce that probabilityby changing how quiet! silences
code. Rather than silencing them completely, they will be logged
to *Messages* but not displayed in the echo area.

Also, quiet! is now used less, where it isn't strictly needed (or where
inhibit-message is sufficient).

core/cli/byte-compile.el

@@ -144,7 +144,7 @@ If RECOMPILE-P is non-nil, only recompile out-of-date files."
                               total-fail)
                              (t
                               (print! (green "✓ Compiled %s") short-name)
-                              (quiet! (load target t t))
+                              (load target t t)
                               total-ok))))
                   (cl-incf total-noop)))
               (print! (bold (color (if (= total-fail 0) 'green 'red)