Entity positioning

On last week I’ve made terrain positioning of new entities. It allows to see position where entity will be created. But the preview mesh isn’t the same as entity that will be created.

This is the goal for next week—make preview fully represent new entity. To achieve this, I need to implement Erik’s plan on DetachedEntity class and feeding it to model mapping framework. This is partially done but not commited yet.

Also, user interface should be improved—it should stay in “create” mode after creating first entity and allow create fast as many more entities as user wants. Also minor things like changing orientation on mouse scroll should be made.