No more ambient modules for tns-core-modules/* subpackages.

- Use path mappings in tsconfig.json to resolve module typings
- Only use ambient mobules for global API's
- Move single-file modules to a subdir with the same name so that
we can provide a hand-written typing next to it (via package.json)
- Delete all mentions of tns-core-modules.d.ts
- Delete reference d.ts assembly build steps. Not needed anymore.
- HACK! Use a <reference> for global typings in application.d.ts
to avoid publishing a separate @types/tns-core-modules package.
- Rename declarations.d.ts to tns-core-modules.d.ts to preserve
JS project mappings in references.d.ts (the only place we use those)

tns-core-modules/ui/builder/builder.d.ts

@@ -1,18 +1,16 @@
-declare module "ui/builder" {
-    import { View, Template, KeyedTemplate } from "ui/core/view";
-    import { Page } from "ui/page";
+import { View, Template, KeyedTemplate } from "ui/core/view";
+import { Page } from "ui/page";
 
-    export function loadPage(moduleNamePath: string, fileName: string, moduleExports?: any): Page;
-    export function load(fileName: string, exports?: any): View;
-    export function load(options: LoadOptions): View;
-    export function parse(value: string | Template, exports?: any): View;
-    export function parseMultipleTemplates(value: string, exports?: any): Array<KeyedTemplate>;
+export function loadPage(moduleNamePath: string, fileName: string, moduleExports?: any): Page;
+export function load(fileName: string, exports?: any): View;
+export function load(options: LoadOptions): View;
+export function parse(value: string | Template, exports?: any): View;
+export function parseMultipleTemplates(value: string, exports?: any): Array<KeyedTemplate>;
 
-    export interface LoadOptions {
-        path: string;
-        name: string;
-        attributes?: any;
-        exports?: any;
-        page?: Page;
-    }
-}
+export interface LoadOptions {
+    path: string;
+    name: string;
+    attributes?: any;
+    exports?: any;
+    page?: Page;
+}