Fix soundness issue with Object.values and Object.entries.

Back in November 2016, a PR (microsoft#12207) was submitted to make the types of `Object.entries` and `Object.values` generic.  This PR was reviewed and accepted, and as a note it was recommended that `Object.keys` be updated similarly.  The author then submitted a PR to update `Object.keys` (microsoft#12253) but @ahejlsberg made the [very valid point](microsoft#12253 (comment)) that this change was unsound and the PR was closed.  The author of both PRs then suggested that perhaps microsoft#12207 should be reverted, but this change never happened.

This PR tries to rectify this situation and make `Object.entries` and `Object.values` consistent with the sound behavior of `Object.keys`.  The major issue here is that this *IS* a breaking change since people may be relying on the currently unsound behavior of `Object.values` and `Object.entries`.  However, I think having TypeScript be inconsistent on this front indefinitely is not good, so at the least this PR should be merged into TS 4.x.

src/lib/es2017.object.d.ts

@@ -3,25 +3,13 @@ interface ObjectConstructor {
      * Returns an array of values of the enumerable properties of an object
      * @param o Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
      */
-    values<T>(o: { [s: string]: T } | ArrayLike<T>): T[];
+    values(o: object): unknown[]
 
     /**
-     * Returns an array of values of the enumerable properties of an object
-     * @param o Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
-     */
-    values(o: {}): any[];
-
-    /**
-     * Returns an array of key/values of the enumerable properties of an object
-     * @param o Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
-     */
-    entries<T>(o: { [s: string]: T } | ArrayLike<T>): [string, T][];
-
-    /**
-     * Returns an array of key/values of the enumerable properties of an object
-     * @param o Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
-     */
-    entries(o: {}): [string, any][];
+      * Returns an array of key/values of the enumerable properties of an object
+      * @param o Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
+      */
+    entries(o: object): [string, unknown][]
 
     /**
      * Returns an object containing all own property descriptors of an object