Make server respond to simulation requests correctly

[zachoooo]

To respond to simulation requests correctly we need to complete the following tasks:

• Correctly parse incoming network elements
  • Extract buses and add to network
  • Extract loads and external grids and add to network
  • Extract lines and connect buses using lines
  • Extract switches and connect to lines
  • Extract transformer and connect to buses
  • Extract storage and connect to buses
  • Extract generators and connect
• Correctly parse incoming 3 phase network elements
  • Extract asym generator and connect to buses
  • Extract asym load and connect to buses
• Extract power flow results
• Respond with results