merge: upstream fixes (mutt/default)

 * Fix mutt_refresh() pausing during macro events.
 * Add a menu stack to track current and past menus.
 * Change CurrentMenu to be controlled by the menu stack.
 * Set refresh when popping the menu stack.
 * Remove redraw parameter from crypt send_menus.
 * Don't full redraw the index when handling a command from the pager.
 * Filter other directional markers that corrupt the screen.
 * Remove the OPTFORCEREDRAW options.
 * Remove SidebarNeedsRedraw.
 * Change reflow_windows() to set full redraw.
 * Create R_MENU redraw option.
 * Remove refresh parameter from mutt_enter_fname().