Command parameter completion

gistfile1.txt

We have two options for implementing the command parameter suggestion:

A)
  The CommandParameterAdapter (https://github.com/Limeth/Terasology/blob/develop/engine/src/main/java/org/terasology/logic/console/internal/adapter/CommandParameterAdapter.java) would have a method returning all possible cases, while a CommandParam would accept a Predicate-like object filtering those cases. The filtered cases would then be suggested after being composed to Strings by the corresponding CommandParameterAdapter.

B)
  The CommandParam would accept a 'suggestion' parameter of a class implementing an interface with a return type of Object[] or Collection<Object>. The returned values would then be suggested after being composed to Strings by the corresponding CommandParameterAdapter.