(Fx_popup_menu): Allow t as position, meaning use mouse pos.
Allow nil as position, meaning just precompute equiv-key data. Mouse events have coords in pixel units. (menu_item_equiv_key): Cached equiv-key data is a sublist. Most of file rewritten. (menu_items, menu_items_*): New variables. (MENU_ITEMS_*): New macros. (init_menu_items, discard_menu_items, push_menu_pane, push_menu_item) (finish_menu_items): New functions. (menu_item_enabled_p): New function. (keymap_panes, single_keymap_panes): Major rewrite; most args changed. (list_of_panes, list_of_items): Major rewrite; most args changed. (Fx_popup_menu): Major rewrite. Now independent of display mechanism. No more conditionals here. (set_menu_items, free_menu_items): Functions deleted. (xmenu_show): Both versions rewritten to work from menu_items and to do all the conditionalized things that were in Fx_popup_menu. (unread_menu_bar_button, other_menu_bar_item_p): New functions. (check_mouse_other_menu_bar): New function.
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