New Base Buildings

We're increasing the fun in the base.

Buildings currently planned:

- Nuclear generators (expensive but produce a lot of energy).
   They will automatically transfer the energy to the batteries.
   They will wear out, but very slowly.
   Once used, it cannot be regenerated or recharged.
   It needs to be demolished and a new one can be built.
   I plan two sizes: MK1 (small) and MK2 (big).

- Rocket launchers (automatically defend the base from flying creatures).
   They need a supply of rockets in the storage.
   They download them automatically.