Adds an entity to scene.
position are the initial coordinates
angle is the initial rotating angle
this function copies to &out a handle to the new entity
leave an empty string as argument to alternativeName in order to use the default entity name (fileName).
scale sets the initial entity scale value
This funcion returns the new entity ID.
ETHEntity@ soldierHandle;
// Adds a soldier which is twice as big (2.0f as scale)
AddEntity("soldier.ent", vector3(0,0,0), 90.0f, @soldierHandle, "bigger_soldier", 2.0f);