#1 Plugins shouldn't need to explicitly implement an interface

[Johan Walles]

Make a class that extends ACreature.
Start the game.

Current behaviour:
The newly created creature isn't recognized as one by
the plugin architecture.

Expected behaviour:
The newly created creature should have been recognized
as one by the plugin architecture.

Notes:
The reason for this is that the plugin architecture
only recognizes interfaces explicitly implemented by
indexed classes. Extending a class that implements an
interface isn't enough. For usability reasons, it
should be.