Move the condition to reset a mark animation inside a method of model_mark.
Adds the flag allowing to reset a mark animation with the action.

The engine reads the flag from the model file but the model files are not
produced with this flag yet.
Finalisation of the flag allowing to reset an animation with an action, or not.

The option is available in the mark properties frame.

Fix how its value was read in the model loader. It must be read before the index
of the animation.

The version of the editors is now 0.10.0.

Fix the swap and copy functions of bear::engine::model_mark. Some members were
not set.