Add matrix factorization to all actions

[patriacaelum]

At the moment, none of the actions are actually related to an action. What we want is to map some of the actual parameters of the wallet and proposals to their feature vector, and some that are random or latent features.

For example, the feature vector has 10 numbers. Let's say 5 are based actual parameters, like the epoch length, stake, total funds, etc. And the other 5 are random numbers.

What we want see is something similar to what we had where wallets with fewer funds are more likely to be brokers and wallets with more funds are more likely to be payers.