add wall property to tile; why did I make "avatar" a tile? smh

src/test-resources/basic/tiles/avatar.toml

@@ -1 +0,0 @@
-images = ["avatar"]

src/test-resources/basic/tiles/block.toml

@@ -0,0 +1,2 @@
+images = ["block"]
+wall = false

src/tile.rs

@@ -9,6 +9,7 @@ pub struct Tile {
     /// todo should there be animation options? reverse, random, etc?
     /// todo do we need a "current frame" property or leave that up to the player implementation?
     pub images: Vec<String>,
+    pub wall: bool,
 }
 
 impl Tile {
@@ -19,13 +20,14 @@ impl Tile {
             &read_to_string(path).unwrap()
         ).unwrap();
 
-        Tile { name, images: intermediate.images }
+        Tile { name, images: intermediate.images, wall: intermediate.wall }
     }
 }
 
 #[derive(Debug, Eq, PartialEq, Serialize, Deserialize)]
 struct IntermediateTile {
     images: Vec<String>,
+    wall: bool,
 }
 
 #[cfg(test)]
@@ -35,9 +37,15 @@ mod test {
 
     #[test]
     fn from_file() {
-        let path = PathBuf::from("src/test-resources/basic/tiles/avatar.toml");
+        let path = PathBuf::from("src/test-resources/basic/tiles/block.toml");
         let output = Tile::from_file(path);
-        let expected = Tile { name: "avatar".into(), images: vec!["avatar".to_string()] };
+
+        let expected = Tile {
+            name: "block".into(),
+            images: vec!["block".to_string()],
+            wall: false
+        };
+
         assert_eq!(output, expected);
     }
 }