Event listeners no longer take reporter config in constructor

This also required splitting out Listener factory from
the reporter factory hierarchy. In return, the listener
factories only need to take in `IConfig const*`, which
opens up further refactorings down the road in the colour
selection and implementation.

src/catch2/interfaces/catch_interfaces_combined_tu.cpp

@@ -86,4 +86,5 @@ namespace Catch {
 
 namespace Catch {
     IReporterFactory::~IReporterFactory() = default;
+    EventListenerFactory::~EventListenerFactory() = default;
 }

src/catch2/interfaces/catch_interfaces_registry_hub.hpp

@@ -27,6 +27,7 @@ namespace Catch {
     struct SourceLineInfo;
 
     class StartupExceptionRegistry;
+    class EventListenerFactory;
 
     using IReporterFactoryPtr = Detail::unique_ptr<IReporterFactory>;
 
@@ -45,7 +46,7 @@ namespace Catch {
     struct IMutableRegistryHub {
         virtual ~IMutableRegistryHub(); // = default
         virtual void registerReporter( std::string const& name, IReporterFactoryPtr factory ) = 0;
-        virtual void registerListener( IReporterFactoryPtr factory ) = 0;
+        virtual void registerListener( Detail::unique_ptr<EventListenerFactory> factory ) = 0;
         virtual void registerTest(Detail::unique_ptr<TestCaseInfo>&& testInfo, Detail::unique_ptr<ITestInvoker>&& invoker) = 0;
         virtual void registerTranslator( Detail::unique_ptr<IExceptionTranslator>&& translator ) = 0;
         virtual void registerTagAlias( std::string const& alias, std::string const& tag, SourceLineInfo const& lineInfo ) = 0;

src/catch2/interfaces/catch_interfaces_reporter_factory.hpp

@@ -15,6 +15,7 @@
 namespace Catch {
 
     struct ReporterConfig;
+    struct IConfig;
     class IEventListener;
     using IStreamingReporterPtr = Detail::unique_ptr<IEventListener>;
 
@@ -27,6 +28,13 @@ namespace Catch {
         virtual std::string getDescription() const = 0;
     };
     using IReporterFactoryPtr = Detail::unique_ptr<IReporterFactory>;
+
+    class EventListenerFactory {
+    public:
+        virtual ~EventListenerFactory(); // = default
+        virtual IStreamingReporterPtr create( IConfig const* config ) const = 0;
+        virtual std::string getDescription() const = 0;
+    };
 } // namespace Catch
 
 #endif // CATCH_INTERFACES_REPORTER_FACTORY_HPP_INCLUDED

src/catch2/interfaces/catch_interfaces_reporter_registry.hpp

@@ -24,10 +24,11 @@ namespace Catch {
     struct IReporterFactory;
     using IReporterFactoryPtr = Detail::unique_ptr<IReporterFactory>;
     struct ReporterConfig;
+    class EventListenerFactory;
 
     struct IReporterRegistry {
         using FactoryMap = std::map<std::string, IReporterFactoryPtr, Detail::CaseInsensitiveLess>;
-        using Listeners = std::vector<IReporterFactoryPtr>;
+        using Listeners = std::vector<Detail::unique_ptr<EventListenerFactory>>;
 
         virtual ~IReporterRegistry(); // = default
         virtual IStreamingReporterPtr create( std::string const& name, ReporterConfig const& config ) const = 0;