BoN phase 1 wave 4

• Refactored interceptors system
• Added miniblocks compaction system to prevent creating large miniblocks
• Added some useful prints info about how many signatures have been received for a block which has not received 2/3 + 1 needed
• Added a mechanism in which a leader who not received the minimum signatures needed for its proposed block, will broadcast its last committed block
• Added a mechanism with which nodes will roll back simultaneously one block if for a certain number of rounds the consensus will not advance
• Improved fork detector by adding also received blocks by nonce to fork choice list
• Fixed a bug which wrongly set last notarized headers when a node bootstrap from storage