feat(typings): Adding Android typings for API levels from 17 to 27 (#5890)

Adding android typings for API levels from 17 to 27

BREAKING CHANGES:
There is no longer added `I` prefix in the names of the interfaces. For example `android.view.IMenuItem` is now `android.view.MenuItem`. This matches the original name of the interface in the android framework.

tns-platform-declarations/android/android-declarations.d.ts

@@ -0,0 +1,15 @@
+/* tslint:disable:no-unused-variable */
+// Android specific TypeScript declarations
+declare function float(num: number): any;
+declare function long(num: number): any;
+
+declare var gc: () => void;
+
+declare function float(num: number): any;
+declare function long(num: number): any;
+
+interface ArrayConstructor {
+    create(type: any, count: number): any;
+}
+
+declare module native {	export class Array<T> {	constructor(); length: number; [index: number]: T; } }