Make labels consistent and add potential clustering type

[m-muecke]

Currently the naming of the labels is inconsistent. Some have clustering or learner appended and some don't.
Would also be nice to have some sort of labelling for the clustering typ:

• Deterministic (hard clustering):

  • Hierarchical classification methods: Agglomerative & divisive methods
  • Optimal partitions: k-means & variants

• Density-based methods: DBSCAN & variants

• Probabilistic (fuzzy clustering):

  • Model-based methods: Mixed distribution models
  • fuzzy k-means & variants

  This is done with properties, the man roxygen is not correct for this, some require updating.

Nice overview: