decommissioned ReconfigureOnChangeFilter and replaced it with  ReconfigureOnChangeTask, added ScheduledExecutorService to Context

It was a mistake to use original httpRequest as long as it is available because web containers may recycle it and populate with the fields from another request. So make sure that when prepareForDeferredProcessing() is called, we will be only using copied data.

Make AccessEvent.prepareForDeferredProcessing() to create a copy of the request attributes map so attributes are available later even if processing is done in a background thread.

Only Serializable attributes are copied to be on a safe side. Also, do not copy attributes set by Logback's TeeFilter as the very same information is already serialised as request/response content.

Make sure TeeHttpServletResponse uses the response character encoding
when contructing a new writer.

Make prepareForDeferredProcessing on AccessEvent idempotent, otherwise the OutputStreamAppender overwrites valid properties with now invalid properties when using an async appender