A-Frame plugin: add ar-pointer-tracker.space

docs/api/plugin-aframe.md

 
 *Since:* 0.4.0
 
+**Properties**
+
+* `space: string`. The [space](./pointer-tracker.md#space) in which pointers will be located. *Since:* 0.4.1
+
 **Example**
 
 ```html

plugins/aframe-with-encantar.js

 AFRAME.registerComponent('ar-pointer-tracker', ARComponent({
 
     schema: {
+
+        /** the space in which pointers will be located */
+        'space': { type: 'string', default: 'normalized' },
+
     },
 
     validate()
 
     tracker()
     {
-        return AR.Tracker.Pointer();
+        return AR.Tracker.Pointer({
+            space: this.data.space
+        });
     },
 
 }));
 AFRAME.registerPrimitive('ar-pointer-tracker', {
     defaultComponents: {
         'ar-pointer-tracker': {}
+    },
+    mappings: {
+        'space': 'ar-pointer-tracker.space'
     }
 });