The morph editor has been created. There is no way to switch to it in
the UI, though and the morph fitting is not taken into account.
There are now two selection scheme. The simple selection allows to
select ships that will follow the orders, the action selection set
stores the targets of any future action.
Orders have been created and are taken into account, the simplest one is
the TakeDamageOrder which tells a ship to take the damage dealt by
another one.
The debug rendering now shows the mass of a ship (the more red, the
heavier the mass loss)