refactor: improve tree shaking abilities

Internal refactor completed in order to improve tree shaking and dead
code removal. The public API, with an exception to ion-slides, has
stayed the same. However, internally many changes were required so
bundlers could better exclude modules which should not be bundled.
Ultimately most changes resorted to removing references to `window` or
`document`, or a module that referenced one of those.

BREAKING CHANGES

ion-slides was refactored to remove the external dependencies, and
rewritten in TypeScript/ES6 modules to again improve tree shaking
abilities.

src/components/slides/slide.ts

@@ -0,0 +1,43 @@
+import { ChangeDetectionStrategy, Component, ElementRef, Renderer, ViewEncapsulation } from '@angular/core';
+
+import { Slides } from './slides';
+
+ /**
+  * @name Slide
+  * @description
+  * The Slide component is a child component of [Slides](../Slides). The template
+  * should be written as `ion-slide`. Any slide content should be written
+  * in this component and it should be used in conjunction with [Slides](../Slides).
+  *
+  * See the [Slides API Docs](../Slides) for more usage information.
+  *
+  * @demo /docs/v2/demos/src/slides/
+  * @see {@link /docs/v2/api/components/slides/Slides/ Slides API Docs}
+  */
+@Component({
+  selector: 'ion-slide',
+  template:
+    '<div class="slide-zoom">' +
+      '<ng-content></ng-content>' +
+    '</div>',
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  encapsulation: ViewEncapsulation.None,
+})
+export class Slide {
+
+  constructor(
+    elementRef: ElementRef,
+    renderer: Renderer,
+    private _slides: Slides
+  ) {
+    renderer.setElementClass(elementRef.nativeElement, 'swiper-slide', true);
+    _slides.update(10);
+  }
+
+  /**
+   * @private
+   */
+  ngOnDestroy() {
+    this._slides.update(10);
+  }
+}