[FEATURE] Support Waves Protocol 1.5

[alexeykiselev]

List of tasks required to support Waves Protocol version 1.5

Preparation

• [ ] Network stack refactoring
  • [ ] Extract the connection logic into a separate FSM that should work on every P2P connection
• [x] State refactoring
  • [x] Introduce a separation layer that allows to apply to the state an intermediate state objects
  • [x] Implement state intermediate structures and hashing functions for them
  • [x] Implement functions to convert transactions into a lists of intermediate structures
• [ ] Other
  • [x] #1134
  • [ ] Implement tree-like script results
  • [x] #1186
  • [ ] #1389