Add advanced functions

[digital-codes]

• Bag of words
• Word cloud
• More text/NLP stuff
• Feed readers (tagesschau, .Bundestag ..)
• Naive Bayse NN or other (e.g layer widget, activation widget, i/O widgets)
• Train model
• Load/save model
• Eval model
• Some more advances ML (remember, we have some TF functions)
• API access
• Graph queries to e.g. Wikidata, OM
• Table relations