Exception mapper reports downgraded, issues

[winsvega]

What we lost with refactoring:

• if there are 2 exceptions defined with the same string, there is no error anymore.
• on exception mismatch
  Want: TransactionException.TYPE_3_TX_BLOB_COUNT_EXCEEDED
  exception that is wanted does not hint the exception string anymore
• if wanted exception is not defined there is no hint that it is not defined and where it must be define (mapper file .py)
• exception verification with eest stopped working for some reason (but works with evmone)
• mapper name atribute of exception is set to None in hint messages

[winsvega]

#1247

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