Farewell for now asteroids

Looting in the asteriod state is now possible.
The exact drop rates will be set during polishing.
As well as the making of the decision if loot should move and dissappear after a while.
I intentionally left out the influence of the destroyed number of asteroids on the quality of dropped loot as it just did not feel right.
Some minor changes where implemented as well as usual, e.g. by pressing "Start" the asteroid state pauses.