Issue #2383843: Remove files moved to service_container.
Issue #2383843: Move to use service_container project.

- Remove no longer needed functions.
- Use the new plugin names from service_container.
Issue #2383843: Make RenderCache extend Drupal.
Issue #2383843: Fix bugs.
Issue #2383843: Remove most components, leave NestedArray for unit tests.
Issue #2383843: Fix remaining render_cache references.
Issue #2383843: Fix tags syntax.
Issue #2383843: Use simplified syntax for registering plugin managers.
Issue #2383843: Fix comments.
Merge pull request #3 from LionsAd/use-service_container

Issue #2383843: Move to use service_container project