Reimplement or remove emulation statistics

[Rot127]

The aek, aea and aeA commands provide statistics about the emulation.
But it uses sdb for this, so it should be replaced or removed.
This is related to the knowledge base we will implement in the future.

[Rot127]

As @wargio pointed out, the RzIL already logs events. The commands simply need to print and build statistics around them.