Integrate the new reporter specs into Catch2

This means that the CLI interface now uses the new key-value oriented
reporter spec, the common reporter base creates the colour implementation
based on the reporter-specific configuration, and it also stores the
custom configuration options for each reporter instance.

Closes #339 as it allows per-reporter forcing of ansi colour codes.

src/catch2/interfaces/catch_interfaces_reporter.cpp

@@ -14,17 +14,31 @@
 #include <catch2/internal/catch_string_manip.hpp>
 #include <catch2/catch_test_case_info.hpp>
 #include <catch2/reporters/catch_reporter_helpers.hpp>
+#include <catch2/internal/catch_move_and_forward.hpp>
 
 #include <algorithm>
 #include <iomanip>
 
 namespace Catch {
 
-    ReporterConfig::ReporterConfig( IConfig const* _fullConfig, IStream const* _stream )
-    :   m_stream( _stream ), m_fullConfig( _fullConfig ) {}
+    ReporterConfig::ReporterConfig(
+        IConfig const* _fullConfig,
+        IStream const* _stream,
+        ColourMode colourMode,
+        std::map<std::string, std::string> customOptions ):
+        m_stream( _stream ),
+        m_fullConfig( _fullConfig ),
+        m_colourMode( colourMode ),
+        m_customOptions( CATCH_MOVE( customOptions ) ) {}
 
     IStream const* ReporterConfig::stream() const { return m_stream; }
     IConfig const * ReporterConfig::fullConfig() const { return m_fullConfig; }
+    ColourMode ReporterConfig::colourMode() const { return m_colourMode; }
+
+    std::map<std::string, std::string> const&
+    ReporterConfig::customOptions() const {
+        return m_customOptions;
+    }
 
     AssertionStats::AssertionStats( AssertionResult const& _assertionResult,
                                     std::vector<MessageInfo> const& _infoMessages,

src/catch2/interfaces/catch_interfaces_reporter.hpp

@@ -19,6 +19,7 @@
 #include <catch2/benchmark/catch_outlier_classification.hpp>
 
 
+#include <map>
 #include <string>
 #include <vector>
 #include <iosfwd>
@@ -31,16 +32,24 @@ namespace Catch {
     class TestCaseHandle;
     struct IConfig;
     class IStream;
+    enum class ColourMode : std::uint8_t;
 
     struct ReporterConfig {
-        ReporterConfig( IConfig const* _fullConfig, IStream const* _stream );
+        ReporterConfig( IConfig const* _fullConfig,
+                        IStream const* _stream,
+                        ColourMode colourMode,
+                        std::map<std::string, std::string> customOptions );
 
         IStream const* stream() const;
         IConfig const* fullConfig() const;
+        ColourMode colourMode() const;
+        std::map<std::string, std::string> const& customOptions() const;
 
     private:
         IStream const* m_stream;
         IConfig const* m_fullConfig;
+        ColourMode m_colourMode;
+        std::map<std::string, std::string> m_customOptions;
     };
 
     struct TestRunInfo {