Add number of confirmation blocks as part of the ChainState

[hackaugusto]

Abstract

The number of confirmations blocks is not equal to all networks, specially for test networks the number of confirmation blocks usually needs to be higher then the confirmation blocks of main net.

Motivation

Allow to easily change the confirmation blocks for different networks

Specification

The ChainState needs a new field, for the number of confirmation blocks, and this data must be made available to the rest o the state machine code. The code must be updated to use the setting from the ChainState instead of the constant module.

Backwards Compatibility

This changes a state object, for forward compatibility the decoding logic of the ChainState class must add set the default value.

[hackaugusto]

Related #1121