added a few more pieces to the framework, overhauled main.cc

src/constants.h

@@ -14,6 +14,8 @@ enum error {none};
 // TODO: update result to include subject
 enum result {fine, died, go_down, hit, moved};
 
+enum game_status {terminated, main_menu, in_game, options};
+
 enum stat_name {HP, ATK, DEF, hostile};
 
 const int LAYER_CNT = 4; // TODO: update as you go
@@ -60,6 +62,8 @@ const feature FEATURE_ENEMIES_CHASE = 1 << 2;
 const feature FEATURE_INVENTORY     = 1 << 3;
 const feature FEATURE_THROW         = 1 << 4;
 const feature FEATURE_REVISIT       = 1 << 5;
+const feature FEATURE_LOG           = 1 << 6;
+const feature FEATURE_SAVE          = 1 << 7;
 
 typedef std::vector<position> position_list;
 typedef std::vector<direction> direction_list;