Moved HttpRequestStore to the GlimpseRequestCtx

- Moved HttpRequestStore from IRequestResponseAdapter as RequestStore to
GlimpseRequestContext
- Separated the creation of the Glimpse script tags from the check
whether or not they were already rendered.
- Removed also some sharing through the use of the HttpRequestStore,
since most of it is not needed anymore due to the presence of the
GlimpseRequestContext