Adding the ability to display "Text" objects from Tiled

I honestly don't believe text objects look good on map, and in real maps, I think text should be written on tiles.

However, for a variety of use cases (like in test maps in the /maps/test directory, it can be useful to be
able to display some text easily on a map.

This PR adds the ability to display this text.

Note: the "font" support cannot work correctly, as Tiled is listing fonts from the local
system, and those fonts are not available in a browser.

front/src/Phaser/Map/ITiledMap.ts

@@ -136,6 +136,20 @@ export interface ITiledMapObject {
      * Polyline points
      */
     polyline: {x: number, y: number}[];
+
+    text?: ITiledText
+}
+
+export interface ITiledText {
+    text: string,
+    wrap?: boolean,
+    fontfamily?: string,
+    pixelsize?: number,
+    color?: string,
+    underline?: boolean,
+    italic?: boolean,
+    strikeout?: boolean,
+    halign?: "center"|"right"|"justify"|"left"
 }
 
 export interface ITiledTileSet {