Fix warnings in project.json

PR #2493 introduced the new project.json schema. The tree has 118 files
with the old schema, which added several hundred warnings.

This change can't go in until PR #2864 does - it relies on those bug
fixes.

TestAssets/TestPackages/dotnet-dependency-tool-invoker/project.json

@@ -1,20 +1,28 @@
 {
   "version": "1.0.0-rc-*",
-  "compilationOptions": {
-    "emitEntryPoint": true
+  "buildOptions": {
+    "emitEntryPoint": true,
+    "compile": {
+      "include": [
+        "**/*.cs",
+        "../../../src/dotnet/CommandLine/*.cs"
+      ]
+    }
   },
-  "compile": [
-    "**/*.cs",
-    "../../../src/dotnet/CommandLine/*.cs"
-  ],
   "dependencies": {
     "Microsoft.NETCore.App": {
       "type": "platform",
       "version": "1.0.0-rc3-*"
     },
-    "Microsoft.DotNet.Cli.Utils": { "target": "project" },
-    "Microsoft.DotNet.ProjectModel": { "target": "project" },
-    "Microsoft.DotNet.Compiler.Common": { "target": "project" }
+    "Microsoft.DotNet.Cli.Utils": {
+      "target": "project"
+    },
+    "Microsoft.DotNet.ProjectModel": {
+      "target": "project"
+    },
+    "Microsoft.DotNet.Compiler.Common": {
+      "target": "project"
+    }
   },
   "frameworks": {
     "netcoreapp1.0": {
@@ -24,4 +32,4 @@
       ]
     }
   }
-}
+}