wip 5 transporters work right

kiln-core/src/board.rs

@@ -488,6 +488,15 @@ impl Board {
     pub fn is_object<P: Into<Point>>(&self, p: P) -> bool {
         matches!(self.get(p), Some(Tile::Object(_)))
     }
+
+    /// Return if there's an object at the given point and if it's mobile
+    pub fn is_mobile<P: Into<Point>>(&self, p: P) -> bool {
+        if let Some(Tile::Object(o)) = self.get(p) {
+            o.mobile
+        } else {
+            false
+        }
+    }
 }
 
 #[cfg(test)]