Redesign Operation Creep Requirements

[MDLeide]

Operation should define only the body type that they require. When a Creep is assigned to the operation, allow it to decide its Role. This will enable existing creeps with compatible body types to be moved around from one op to another as needed.

As a result, the SpawnDefinition class will need to be reworked.

[MDLeide]

Partially completed by implementing assignments, more work to be done on the Operation to be flexible with body types.

[MDLeide]

Operation.onAssignment and abstracting CreepControllers off the main Operation class and into an abstract class ControllerOperation has furthered progress on this issue. Still more, though, must be done, such as an Assignment => AcceptableBody[] map, and support for spawning in advance of a creep death.