New implementation of the tactic monad.

The new implementation is made of two layers: a iolist, which is essentially
a stream without memoization, and above this a state monad. The previous
design of the extracted monad kept three distinct but similar monad
transformers: a stateT, a writerT and a readerT. We take advantage of this
similarity to pack those three transformers into only one state monad.
This makes the code cleaner and hopefully more efficient.

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