Rewrote StandaloneTests

[JanBobolz]

New version now works as follows:

• Instead of writing a parameter class and adding it to this insane list in StandaloneTest, parameter classes are now automatically gathered using reflection.
• By default, I'd now recommend only one parameter class per package instead of per class.
• Parameter classes are now actually called StandaloneReprSubTest. Subclasses implement any number of public methods that are then automatically called at test time. The methods' task is to instantiate a StandaloneRepresentable object and then call StandaloneReprSubTest::test on it.

Example:

public class EncryptionStandaloneReprTests extends StandaloneReprSubTest {
    Group group = new CountingGroup("testgroup", 128);
    ElgamalKEM elgamalKEM = new ElgamalKEM(group, new SHA256HashFunction());

    public void testElGamal() {
        test(elgamalKEM);
        test(new ElgamalEncryption(group));
    }

    public void testStreamingHybrid() {
        test(new StreamingHybridEncryptionScheme(new StreamingCBCAES(), elgamalKEM));
    }
}