Adding nlohmanns json library

CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.15)
 
-set(CMAKE_CXX_STANDARD_REQUIRED 17)
+set(CMAKE_CXX_STANDARD_REQUIRED 20)
 
 # Handle superbuild first
 option (USE_SUPERBUILD "Whether or not a superbuild should be invoked" ON)
@@ -11,6 +11,7 @@ set(SLANG_ROOT ${EXTERNAL_ROOT}/slang)
 set(BOOST_ROOT ${EXTERNAL_ROOT}/boost)
 set(GLM_ROOT ${EXTERNAL_ROOT}/glm)
 set(GLFW_ROOT ${EXTERNAL_ROOT}/glfw)
+set(JSON_ROOT ${EXTERNAL_ROOT}/json)
 set(CMAKE_BINARY_DIR ${CMAKE_CURRENT_SOURCE_DIR}/bin/${CMAKE_BUILD_TYPE})
 set(RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
 set(CMAKE_INSTALL_PREFIX ${CMAKE_BINARY_DIR})
@@ -34,9 +35,11 @@ else()
   project (Seele)
 endif()
 
-add_subdirectory(${GLFW_ROOT})
 find_package(Vulkan REQUIRED)
 find_package(Boost REQUIRED COMPONENTS serialization)
+find_package(Threads)
+include(${JSON_IMPORT})
+include(${GLFW_IMPORT})
 
 include_directories(${GLFW_ROOT}/include)
 include_directories(${GLM_INCLUDE_DIRS})
@@ -52,11 +55,12 @@ if(WIN32)
 	add_compile_definitions(USE_EXTENSIONS)
 endif()
 add_executable(SeeleEngine "")
-add_subdirectory(src/)
+target_link_libraries(SeeleEngine glfw)
+target_link_libraries(SeeleEngine nlohmann_json::nlohmann_json)
 target_link_libraries(SeeleEngine ${Boost_LIBRARIES})
 target_link_libraries(SeeleEngine ${Vulkan_LIBRARY})
-target_link_libraries(SeeleEngine glfw ${GLFW_LIBRARIES})
 target_link_libraries(SeeleEngine ${SLANG_LIBRARY})
+add_subdirectory(src/)
 
 if(MSVC)
   target_compile_options(SeeleEngine PRIVATE /DEBUG:FASTLINK /Zi /W4)