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/absolute-layout/absolute-layout-common.ts

@@ -3,15 +3,6 @@ import { LayoutBase, View, Property, Length, zeroLength } from "ui/layouts/layou
 
 export * from "ui/layouts/layout-base";
 
-declare module "ui/core/view" {
-    interface View {
-        left: Length;
-        top: Length;
-        effectiveLeft: number;
-        effectiveTop: number;
-    }
-}
-
 View.prototype.effectiveLeft = 0;
 View.prototype.effectiveTop = 0;
 
@@ -74,4 +65,4 @@ export const topProperty = new Property<View, Length>({
         }
     }, valueConverter: (v) => Length.parse(v)
 });
-topProperty.register(View);
+topProperty.register(View);