First attempt at data generator support

The support is to be considered experimental, that is, the interfaces,
the first party generators and helper functions can change or be removed
at any point in time.

Related to #850

include/internal/catch_test_case_tracker.h

@@ -95,13 +95,6 @@ namespace TestCaseTracking {
             Failed
         };
 
-        class TrackerHasName {
-            NameAndLocation m_nameAndLocation;
-        public:
-            TrackerHasName( NameAndLocation const& nameAndLocation );
-            bool operator ()( ITrackerPtr const& tracker ) const;
-        };
-
         using Children = std::vector<ITrackerPtr>;
         NameAndLocation m_nameAndLocation;
         TrackerContext& m_ctx;