Use the correct type for properties

tiled/src/tiled/layer.rs

@@ -1,7 +1,5 @@
 use nanoserde::DeJson;
 
-use std::collections::HashMap;
-
 /// https://doc.mapeditor.org/en/stable/reference/json-map-format/#json-chunk
 #[derive(Clone, Debug, Default, DeJson)]
 #[nserde(default)]
@@ -18,14 +16,15 @@ pub struct Chunk {
     pub y: i32,
 }
 
+/// https://doc.mapeditor.org/en/stable/reference/json-map-format/#json-layer
 #[derive(Clone, Debug, Default, DeJson)]
 #[nserde(default)]
 pub struct Layer {
     /// Array of chunks (optional). tilelayer only.
     pub chunks: Option<Vec<Chunk>>,
     pub name: String,
     pub opacity: f32,
-    pub properties: Option<HashMap<String, String>>,
+    pub properties: Vec<Property>,
     pub visible: bool,
     pub width: u32,
     pub height: u32,