Manageable on HstComponents in Spring Application Context

If we allow annotations in HstComponent classes like Spring Framework's @Component, then we can probably allow any Spring AOP techniques without having to provide new interfaces like DoBeforeRenderExtension of Essentials.

As a briefing:

• Developers annotate HstComponent classes with an annotation (e.g, @Component).
• Spring Framework application context loads @Component beans as 'prototype' beans since we need a separate HstComponent instance per HST component configuration even if the hst component classname is the same.
• Then HST Component Factory always get a reference of the HstComponent bean managed by Spring Framework ApplicationContexts (of HST ComponentManager).
  HST Component Factory can be backward-compatible for non-annotated component classes in this approach. It can load it from the HST Component Manager first, for instance.
• developers can use Spring AOP techniques.

One advantage here is developers can control in any granularity with the point cut configuration.