Remove logging and clone utlities (#5309)

* remove log utility functions; remove custom mixin

* fix tests

* add log service as required by telemetry utils

* remove unused code

* replace some console.logs with logservice

src/sql/base/common/objects.ts

@@ -5,25 +5,6 @@
 
 import * as Types from 'vs/base/common/types';
 
-export function clone<T>(obj: T): T {
-	if (!obj || typeof obj !== 'object') {
-		return obj;
-	}
-	if (obj instanceof RegExp) {
-		// See https://github.com/Microsoft/TypeScript/issues/10990
-		return obj as any;
-	}
-	const result = (Array.isArray(obj)) ? <any>[] : <any>{};
-	Object.keys(obj).forEach(key => {
-		if (obj[key] && typeof obj[key] === 'object') {
-			result[key] = clone(obj[key]);
-		} else {
-			result[key] = obj[key];
-		}
-	});
-	return result;
-}
-
 /**
  * A copy of the vs mixin that accepts a custom behavior function
  */