Fix aspect ratio bugs

- ICCCM says: > If a base size is not provided, the minimum size is to
be used in its place and vice versa.
i3 didn't obey the "vice versa" part. Min size and base size are both
saved without replacements in window_update_normal_hints,
floating_check_size makes the needed replacements if either was not
provided.
- Aspect ratio is now saved correctly in manage_window because
window_update_normal_hints is called.
- i3 didn't save the aspect ratio if the window conformed the given
aspect ratio range when handle_normal_hints was called. If the window
was resized to a size outside of the given bounds, i3 didn't correct it.
- Aspect ratio now affects only tiling windows, like the rest of the
normal size hints
- The aspect ratio calculation is now done without a loop

A real life example of how these changes affect the workflow:
An mpv window, when playing a video, sets its min == max aspect ratio
during mapping. i3 ignored these hints. When resized, the window's
aspect ratio was not preserved. With this commit, resizing floating mpv
windows will always preserve the aspect ratio.

src/render.c

@@ -64,35 +64,6 @@ void render_con(Con *con, bool render_fullscreen) {
         inset->width -= (2 * con->border_width);
         inset->height -= (2 * con->border_width);
 
-        /* Obey the aspect ratio, if any, unless we are in fullscreen mode.
-         *
-         * The spec isn’t explicit on whether the aspect ratio hints should be
-         * respected during fullscreen mode. Other WMs such as Openbox don’t do
-         * that, and this post suggests that this is the correct way to do it:
-         * https://mail.gnome.org/archives/wm-spec-list/2003-May/msg00007.html
-         *
-         * Ignoring aspect ratio during fullscreen was necessary to fix MPlayer
-         * subtitle rendering, see https://bugs.i3wm.org/594 */
-        if (!render_fullscreen && con->window->aspect_ratio > 0.0) {
-            DLOG("aspect_ratio = %f, current width/height are %d/%d\n",
-                 con->window->aspect_ratio, inset->width, inset->height);
-            double new_height = inset->height + 1;
-            int new_width = inset->width;
-
-            while (new_height > inset->height) {
-                new_height = (1.0 / con->window->aspect_ratio) * new_width;
-
-                if (new_height > inset->height)
-                    new_width--;
-            }
-            /* Center the window */
-            inset->y += ceil(inset->height / 2) - floor((new_height + .5) / 2);
-            inset->x += ceil(inset->width / 2) - floor(new_width / 2);
-
-            inset->height = new_height + .5;
-            inset->width = new_width;
-        }
-
         /* NB: We used to respect resize increment size hints for tiling
          * windows up until commit 0db93d9 here. However, since all terminal
          * emulators cope with ignoring the size hints in a better way than we