More control over formation changes.

Allow to use :average1 .. :average6 and :fast1 .. :fast3 to allow more control over what player moves to a newer position.
The old way a single change in movement would cause a lot of movement and often leave the team vulnerable.

NOTE: This change is backward compatible. i.e.: the old way of specifying formations will still work.
@afast first of all: thanks for contribuiting :). I'm note sure why this logic was removed over here and moved to the team class. I actually thinks it was well scoped over here and its easy to adapt the removed method to the new changes, is there any important reasons to do this?