removes scc git submodule and adds as FetchContent

.gitmodules

@@ -1,6 +1,3 @@
-[submodule "scc"]
-	path = scc
-	url = https://github.com/Minres/SystemC-Components.git
 [submodule "cmake-conan"]
 	path = cmake-conan
 	url = https://github.com/conan-io/cmake-conan.git

CMakeLists.txt

@@ -1,5 +1,4 @@
 cmake_minimum_required(VERSION 3.16)
-list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/scc/cmake)
 cmake_policy(SET CMP0110 NEW)
 
 project(SCC_Test)
@@ -11,6 +10,22 @@ option(ENABLE_CLANG_FORMAT "Enable clang-format targets" OFF)
 option(THREAD_SANITIZER "Enable thread sanitizer TSan" OFF)
 option(ADDR_SANITIZER "Enable address sanitizer ASan" OFF)
 
+if(IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/scc")
+    list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/scc/cmake)
+else()
+    include(FetchContent)
+    FetchContent_Declare(
+        scc_git
+        GIT_REPOSITORY https://github.com/Minres/SystemC-Components.git
+        GIT_TAG develop
+    )
+    FetchContent_GetProperties(scc_git)
+    if(NOT scc_git_POPULATED)
+        FetchContent_Populate(scc_git)
+    endif()
+    list(APPEND CMAKE_MODULE_PATH ${scc_git_SOURCE_DIR}/cmake)
+endif()
+
 include(GNUInstallDirs)
 include(BuildType)
 
@@ -72,6 +87,11 @@ include(CTest)
 include(Catch)
 enable_testing()
 set(WITH_SCP4SCC ON)
-add_subdirectory(scc)
+
+if(IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/scc")
+    add_subdirectory(scc)
+else()
+    add_subdirectory(${scc_git_SOURCE_DIR})
+endif()
 add_subdirectory(src)
 add_subdirectory(tests)