TrigNavTools+AthenaKernel: Remove #define protected.

Remove non-standard use of #define protected.

Make TrigNavigationThinningSvc a frield of IThinningSvc. Removes the need for a #define protected downstream. (Should be temporary anyway, since IThinningSvc is going away.)

This merge request affects 2 packages:

• Control/AthenaKernel
• Trigger/TrigEvent/TrigNavTools

Adding @ssnyder ,@rbianchi as watchers

added Core Trigger master review-pending-level-1 labels

CI Result SUCCESS

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-26528-2019-09-12-10-01
Athena: number of compilation errors 0, warnings 1
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 3211]

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

merged

mentioned in commit 14bb749b

added sweep:ignore label