feat(framework): Add dynamic language change and on-demand rerendering

[vladitasev]

You can test this change with the new RTL.html page in main.

This change adds:

• A low-level method in RenderScheduler which allows to re-render all components on the page, only the rtlAware ones, only the languageAware ones, or both.
• A setLanguage method in the configuration
• A applyDirection method in base/scr/locale which re-renders rtl-aware components
• The capability to re-fetch all message bundles when the language changes.

In order to be able to determine what to re-render, RenderScheduler needs to keep a Set of all active components on the page:

• components that don't have a template are not registered/deregistered
• components are registered on onEnterDOM
• components are deregistered on onExitDOM
  The reason for this logic is that we don't want to keep references to elements forever, as that would prevent garbage collection. Instead we only re-render active elements.

In order to be able to determine which components are rtl-aware, we track their calls to the effectiveDir function. There is a small new registry for that purpose.

Additional changes:

• utility method setToArray added because of IE support
• fireEvent in EventProvider.js now returns an array of the results of all registered event listeners. This is very handy if these listeners do async work, and you want to wait for this work, as we do here in Language.js.