Uses msigdbr packages instead of msigdb.data

[lianos]

The getMSigGeneSetDb function updated to use msigdbr, and the msigdb.data package has been dropped as a dependency.

The functionality provided is still roughly the same, but promotion of subcategories to main collections is a bit different:

• The default value for promote_subcategory_to_collection is now FALSE
• You can't ask for "kegg" or "go" as main collections (for now)
• You can prefix the C1, ..., C8 collections with "MSigDB_" with prefix_collection = TRUE

The implementation of scale_rows has changed a bit. Be very weary of setting scale = TRUE when normalizing against a subset of samples.