Rename HostBinding or add a different decorator for global bindings

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[x] feature request
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Current behavior

We use @HostBindnig and @HostListener decorators to bind to the host element. We also use the same decorator to bind to window using the : syntax, and window is not the host element, leading to confusing syntax.

Suggested behavior

After a short discussion with @DzmitryShylovic on Gitter here are some alternatives:

• Add a @WindowListener decorator specifically to replace current syntax window:
• Add a @GlobalListener decorator for general global stuff (including window:, body: and potentially title:, see #11698).
• Deprecate @HostListener and use @Binding for all of these, where leading host: would be optional since that’s the most common use-case

IMO the last alternative makes the most sense.

What is the motivation / use case for changing the behavior?

Easier to understand and consistent syntax.

• Angular version: 2.0.0
• Browser: all
• Language: TypeScript

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