Fix and simplify the BABE runtime
The BABE runtime was massively overcomplicated and also wrong. It assumed it needed to: 1. delay new authorities taking effect until the next epoch 2. not delay emitting `Consensus` digests to mark epoch changes However, the first is handled by the `srml_session` crate, and the second is flat-out incorrect: `Consensus` digests take effect immediately. Furthermore, `srml_babe` tried to duplicate the functionality of `srml_session::PeriodicSession`, but did it both clumsily and incorrectly. Fortunately, the new code is simpler and far more likely to be correct.
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