Add combat stats and scaling to enemies, Add treasure

src/game_state.rs

src/game_state/combat_log.rs

src/game_state/config.rs

src/game_state/enemy.rs

src/game_state/level.rs

src/game_state/player.rs

src/game_state/run.rs

src/game_state/textures.rs

src/game_state/tile.rs