Allow a not stateful canvas to fire object:modified at end of transform.

[asturur]

Need some manual testing.

The problem is this can fire if the object is dragged around and left in same place it was before dragging.

Closes #2362
closes #1927

[asturur]

needs major rework.
Actually rotating, skew, scale moving fire even when the object is locked on those actions.

I will add a property to current transform to detect if something happened during transform.
target.Moving is good for that.

[asturur]

I added some more booleans to our boolean salad that was in the scaling and skewing events.
Now we should be able to understand when a transformation modified the object or not and fire the proper event and object:modified.

A this point stateful could be defaulted to false, since saving and checking the object stateProperties is needed just for advanced features. But being a breaking change i will not change it now.