Some refactor of special node system

- Context type (town/out/scen) is now an enum
- Don't expose internals in the header
- Use a state struct to pass things around through the system
- Fix special AFFECT_DEADNESS case for default party selection
- Maybe other bits and pieces?

src/game/boe.items.hpp

@@ -22,7 +22,7 @@ bool show_get_items(std::string titleText, std::vector<cItem*>& itemRefs, short
 bool display_item(location from_loc,short pc_num,short mode, bool check_container);
 short custom_choice_dialog(std::array<std::string, 6>& strs,short pic_num,ePicType pic_type,std::array<short, 3>& buttons) ;
 void custom_pic_dialog(std::string title, pic_num_t bigpic);
-void story_dialog(std::string title, str_num_t first, str_num_t last, int which_str_type, pic_num_t pic, ePicType pt);
+void story_dialog(std::string title, str_num_t first, str_num_t last, eSpecCtxType which_str_type, pic_num_t pic, ePicType pt);
 short get_num_of_items(short max_num);
 void init_mini_map();
 void draw_help_dialog_item_buttons(cDialog& dialog,short item);