VR Side: Unity/Server Connections

[jasmine-bae]

Major changes (i.e. implementing server functionality into our interface!), still not completely stable:

Changes:

• Upgraded to Unity 2019.4.11.F1 (LTE)
• Depreciated all ROS connections within the VR Interface, other than one which is used to contact and receive from the server
• Depreciated ROSManager, replaced with new ServerConnections
• Fixed a major bug with RosBridgeLib's internal code that was preventing responses back to our interface in general
• Update to drone_v2 (which supports server functionality)
• Update to Server Connections (which handles all communication to and from the server)
• Added Fall 2020 Testing Scripts, which can be used to call services to the server (and receive info)

Todo:

• Figure out why inputs do not work for drone service calls
• Implement sensor service calls and functionality