Remove requirements for lists in setters

[julesjacobsen]

This sort of looks fine on the outside:

public void setTypes(List<OntologyClass> classes) {
        this.types = ImmutableList.copyOf(classes);
    }

but leads to code looking like this:

Phenotype whiteHandsPhenotype = new Phenotype();
whiteHandsPhenotype.setTypes(ImmutableList.of(
        OntologyClass.of("PATO:0000323", "white"),
        OntologyClass.of("PATO:0000586", "increased size"),
        OntologyClass.of("UBERON:0002398", "manus")
));

Phenotype happyDisposition = new Phenotype();
happyDisposition.setTypes(ImmutableList.of(
        OntologyClass.of("HP:0100024","Conspicuously happy disposition"))
);
happyDisposition.setDescription("welcomes strangers with open arms");

TemporalRegion timeOfOnset = new TemporalRegion();
timeOfOnset.setTypes(ImmutableList.of(OntologyClass.of("HP:0011463", "childhood onset")));
happyDisposition.setTimeOfOnset(timeOfOnset);

Phenotype absentVibrisae = new Phenotype();
absentVibrisae.setTypes(ImmutableList.of(
        OntologyClass.of("MP:0001284","absent vibrissae"))
);
Phenotype circularEars = new Phenotype();
circularEars.setTypes(ImmutableList.of(
        OntologyClass.of("PATO:0000411","circular"),
        OntologyClass.of("UBERON:0001690", "ear")
));

That's five repetitions of ImmutableList.of() which is a lot of unnecessary noise, and typing.