CxxUtils: Add releasing_iterator.

Helper to convert an iterator over unique_ptr to one over T*.

Build area was cleaned as per request posted in the DB. The full software build will be performed

This merge request affects 1 package:

• Control/CxxUtils

This merge request affects 4 files:

• Control/CxxUtils/CMakeLists.txt
• Control/CxxUtils/CxxUtils/releasing_iterator.h
• Control/CxxUtils/share/releasing_iterator_test.ref
• Control/CxxUtils/test/releasing_iterator_test.cxx

Adding @ssnyder ,@rbianchi as watchers

added Core master review-pending-level-1 labels

CI Result SUCCESS (hash 4dc99552)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 66213]

added review-user-action-required label and removed review-pending-level-1 label

resolved all threads

removed review-user-action-required label

added review-pending-level-1 label

Okay, then looks good to me. L1

added review-approved label and removed review-pending-level-1 label

added review-approved-tier0 label

added review-approved-point1 label

merged

mentioned in commit d9695e9d

added sweep:ignore label