Restructure build targets of CMake configuration

* Rename the library under test from src to GildedRoseLib.
* Move the lib folder to test/third_party and handle ApprovalTests.hpp as header-only dependency.
* Remove the superfluous googletest_approval_main.cpp (in the same sense as there is only one GildedRoseCatch2ApprovalTests.cc)
* Set USE_FOLDERS property such that target ALL_BUILD, RUN_TESTS and ZERO_CHECK are grouped for Visual Studio.
* Set WORKING_DIRECTORY such that the RUN_TESTS target works successfully.
* Fix C++ language standard for Catch2 v3 to C++14.
* Bump third-party dependencies
  * Update ApprovalTests.hpp to v10.13.0
  * Update Catch2 to v3.8.0
  * Update GTest to v1.16.0

cpp/CMakeLists.txt

@@ -1,37 +1,11 @@
 cmake_minimum_required(VERSION 3.13)
 project(gilded-rose-refactoring-kata-cpp)
 
-# Load FetchContent module.
-include(FetchContent)
-
-# Declare GoogleTest as the content to fetch
-FetchContent_Declare(
-  googletest
-  GIT_REPOSITORY https://github.com/google/googletest.git
-  GIT_TAG release-1.12.1
-)
-
-FetchContent_Declare(
-  catch2 
-  GIT_REPOSITORY https://github.com/catchorg/Catch2.git
-  GIT_TAG v3.3.2
-)
-
-FetchContent_MakeAvailable(googletest catch2)
-
-#set(gtest_force_shared_crt OFF CACHE BOOL "" FORCE)
-# Force Google Test to link the C/C++ runtimes dynamically when
-# building on Visual Studio
-# Link:
-# * https://github.com/google/googletest/tree/release-1.8.1/googletest#visual-studio-dynamic-vs-static-runtimes
-if (MSVC)
-  set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
-endif()
+set_property(GLOBAL PROPERTY USE_FOLDERS ON)
 
 # uncomment this line to enable coverage measurements using gcov
 # set(CMAKE_CXX_FLAGS "--coverage")
 
 enable_testing()
 add_subdirectory(src)
-add_subdirectory(lib)
 add_subdirectory(test)