Add support for native debugging

[BillHiebert]

Addresses issue: #1125

Native debugging is enabled by adding "nativeDebugging" : true to the launch profile as follows

{
  "profiles": {
    "ConsoleApp3": {
      "commandName": "Project",
      "nativeDebugging": true
    }
  }
}

This property will automatically be picked up by the LaunchSettingsManager and added to the OtherProperties property bag. This change does not add any UI support.

[tmat]

Closing and reopening in attempt to abandon old builds.

[clairernovotny]

Keep in mind @gregg-miskelly's comment here:
#2696 (comment)

The debugger bug is https://devdiv.visualstudio.com/DefaultCollection/DevDiv/_queries?id=446401 (note: you must be a Microsoft employee to access this).

There is something needed before .NET Core native debugging works

[davkean]

That bug will be fixed in the same build as this fix (15.5).