[x-tabdeveloping]

Multiple things in this update.

New models

• Implementation of vSLDA, which also resulted in improvements to the Late API
• Wrappers around LDA and NMF so that people can use them as baselines

I added documentation for the new models and reorganized the model overviews around them.

SensTopic

• Added hierarchical fitting, but limited to two levels for now, as it doesn't seem to work with more levels too well.
• Added a GliFormer-based vectorizer that could be used for concept or term extraction

TODO: THESE NEED TO BE DOCUMENTED