Baseline support for Multi-OMICs / different OMICs

[JudithBernett]

Support that baseline can be fitted with either gene expression or protein abundance or methylation or … only

(or a combination of them?)

[JudithBernett]

It's already possible to run separate models (e.g., GeneExprRandomForest, MethylationRandomForest), but it is not possible yet to just use RandomForest and automatically adapt which input features should be used