Add documentation and CHANGELOG

Modify error message

CHANGELOG.md

@@ -10,12 +10,12 @@
 - New scripting API features :
   - Use `WA.room.showLayer(): void` to show a layer
   - Use `WA.room.hideLayer(): void` to hide a layer
-  - Use `WA.room.setProperty() : void` to add or change existing property of a layer
+  - Use `WA.room.setProperty() : void` to add, delete or change existing property of a layer
   - Use `WA.player.onPlayerMove(): void` to track the movement of the current player
   - Use `WA.room.getCurrentUser(): Promise<User>` to get the ID, name and tags of the current player
   - Use `WA.room.getCurrentRoom(): Promise<Room>` to get the ID, JSON map file, url of the map of the current room and the layer where the current player started
   - Use `WA.ui.registerMenuCommand(): void` to add a custom menu
-  - Use `WA.room.setTiles(): void` to change an array of tiles
+  - Use `WA.room.setTiles(): void` to add, delete or change an array of tiles
 - Users blocking now relies on UUID rather than ID. A blocked user that leaves a room and comes back will stay blocked.
 
 ## Version 1.4.3 - 1.4.4 - 1.4.5

docs/maps/api-room.md

@@ -134,6 +134,7 @@ If `tile` is a string, it's not the id of the tile but the value of the property
 
 **Important !** : If you use `tile` as a number, be sure to add the `firstgid` of the tileset of the tile that you want to the id of the tile in Tiled Editor.
 
+Note: If you want to unset a tile, use `setTiles` with `tile` set to `null`.
 
 Example : 
 ```javascript

front/src/Phaser/Game/GameMap.ts

@@ -239,11 +239,7 @@ export class GameMap {
                 console.error("The tile '" + tile + "' that you want to place doesn't exist.");
             }
         } else {
-            console.error(
-                "The layer '" +
-                    layer +
-                    "' that you want to change is not a tilelayer. Tile can only be put in tilelayer."
-            );
+            console.error("The layer '" + layer + "' does not exist (or is not a tilelaye).");
         }
     }