(Fw32_register_hot_key, Fw32_unregister_hot_key)

(Fw32_register_hot_key, Fw32_unregister_hot_key)
(Fw32_toggle_lock_key) [USE_LISP_UNION_TYPE]: Cast from Lisp_Object
using i member.
(w32_quit_key): Rename from Vw32_quit_key, and make an int.
(syms_of_w32fns, globals_of_w32fns): Use Lisp_Object and int consistently.
(w32_color_map_lookup): Return a Lisp_Object.
(x_to_w32_charset, w32_to_x_charset, w32_to_all_x_charsets):
Use EQ to compare Lisp_Objects.
(w32_parse_hot_key): Use int for lisp_modifiers consistently.
(w32_wnd_proc): Use w32_num_mouse_buttons.