Small strict null checking pass on a few files (#4293)

* fix some null checking

* fix various null strict checks

* move location fo sql files in json

* fix compile and more unused properties

* formatting

* small formatting changes

* readd types

* add comments for angular components

* formatting

* remove any decl

src/sql/base/browser/ui/breadcrumb/breadcrumb.component.ts

@@ -30,7 +30,7 @@ import { IDisposable } from 'vs/base/common/lifecycle';
 				`
 })
 export class BreadcrumbComponent implements OnInit, OnDestroy {
-	private menuItems: MenuItem[] = [];
+	protected menuItems: MenuItem[] = []; // used by angular template
 	private disposables: Array<IDisposable> = new Array();
 
 	constructor(