Scene JSON has problems with primitive types

[siquel]

Rotation is float, so we need way to assign values to primitive types instead of structs. It will generate assertation fault because float does not have "rotation" field.

"components": [ {
                    "name": "sani::Transform",
                    "fields": [
                          { 
                            "name": "position", 
                            "fields": [{"x": "5"}, {"y": "5"},{"z": "0"} ]
                          },
                          {
                            "name": "scale",
                            "fields": [ {"x":"1"},{"y":"1"} ]
                          },
                          {
                            "name":"rotation",
                            "fields":[ {"rotation": "0"} ]
                          }
                    ]
                }]