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/layouts/dock-layout/dock-layout-common.ts

@@ -10,12 +10,6 @@ function validateArgs(element: View): View {
 
 export * from "ui/layouts/layout-base";
 
-declare module "ui/core/view" {
-    interface View {
-        dock: "left" | "top" | "right" | "bottom";
-    }
-}
-
 export class DockLayoutBase extends LayoutBase implements DockLayoutDefinition {
 
     public static getDock(element: View): "left" | "top" | "right" | "bottom" {
@@ -54,4 +48,4 @@ dockProperty.register(View);
 export const stretchLastChildProperty = new Property<DockLayoutBase, boolean>({
     name: "stretchLastChild", defaultValue: true, affectsLayout: isIOS, valueConverter: booleanConverter
 });
-stretchLastChildProperty.register(DockLayoutBase);
+stretchLastChildProperty.register(DockLayoutBase);