allow public uses of structs; add sample program

src/room.rs

@@ -2,13 +2,13 @@ use crate::{Exit, ExitInstance, Instance, mock, Position};
 
 #[derive(Debug, Eq, PartialEq)]
 pub struct Room {
-    pub(crate) id: String,
-    pub(crate) palette: String, // id
-    pub(crate) name: Option<String>,
-    pub(crate) tiles: Vec<String>, // tile ids
-    pub(crate) items: Vec<Instance>,
-    pub(crate) exits: Vec<ExitInstance>,
-    pub(crate) endings: Vec<Instance>,
+    pub id: String,
+    pub palette: String, // id
+    pub name: Option<String>,
+    pub tiles: Vec<String>, // tile ids
+    pub items: Vec<Instance>,
+    pub exits: Vec<ExitInstance>,
+    pub endings: Vec<Instance>,
 }
 
 impl From<String> for Room {