Save/load graph

[IlyaMoskva]

Implement Graph save and load operations to store and re-use the same graph.

• Common parts:

  • ID for entities Add Unique ID for Servers and Edges to make save/load operations easier #46
  • Add Gson for JSON implementation New: Gson added to operate with Graph stored. #45

• Own JSON format

  • Save Save Graph to JSON #42
  • Load Load graph from JSON #43

• .dot format Apply .dot / .gv plugin #24

  • Save
  • Load