Setting variable values

[int19h]

This is about editing variable values in the Locals window and equivalents (but not in Watch; i.e. not arbitrary expressions - that one is #15 ).

Need to implement setVariable request.

[karthiknadig]

Note: VS sends an evaluate request even if it is editing variables in locals window:

 1> [DebugAdapter] --> C (evaluate-17): {"command":"evaluate","arguments":{"expression":"x","frameId":7,"timeout":5000},"seq":17,"type":"request"}
 1> [DebugAdapter] <--   R (evaluate-17): {"type": "response", "seq": 23, "request_seq": 17, "success": false, "command": "evaluate", "message": "Unknown command", "body": {}}
 1> [DebugAdapter] --> C (setVariable-18): {"command":"setVariable","arguments":{"variablesReference":8,"name":"x","value":"int: 2","timeout":10000},"seq":18,"type":"request"}