New Matchers implementation

- simpler
- less templates and machinery
- no cloning, copying or unnecessary heap allocations
- better factored

CMakeLists.txt

@@ -154,6 +154,7 @@ set(INTERNAL_HEADERS
         ${HEADER_DIR}/internal/catch_legacy_reporter_adapter.hpp
         ${HEADER_DIR}/internal/catch_list.hpp
         ${HEADER_DIR}/internal/catch_matchers.hpp
+        ${HEADER_DIR}/internal/catch_matchers_string.hpp
         ${HEADER_DIR}/internal/catch_message.h
         ${HEADER_DIR}/internal/catch_message.hpp
         ${HEADER_DIR}/internal/catch_notimplemented_exception.h