[FEATURE] Extend IntrospectionProcessor to log full Backtrace

Extend the introspection processor so it can add
a full backtrace instead of only the last item
of the backtrace.

Also adds an option to shift a given amount of
levels from the backtrace.

Resolves: #60064
Documentation: #60074
Releases: 6.3
Change-Id: Ieb5d1e8ca11fdfd649d18d7751ebb0f770e60ef5
Reviewed-on: http://review.typo3.org/31296
Reviewed-by: Steffen Müller <typo3@t3node.com>
Tested-by: Steffen Müller <typo3@t3node.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>