Store only consensus data while serialize state

[zxcat]

Code implemented in #1133 serializes almost all data stored in state. But node can be configured to clear votes and other data, which is no more needed for consensus. This makes produced serialized state file dependent on config settings.
Update state serialization to produce file, which doesn't depend on config settings.

[zxcat]

1. remove non-consensus votes
2. remove memo from savings_withdraw_object:

   golos/libraries/chain/steem_evaluator.cpp

   Line 2381 in 2d0d3dd

   if (_db.store_memo_in_savings_withdraws()) {

[zxcat]

PR #1325