Add utfcpp submdule

Author: adazem009

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "thirdparty/googletest"]
 	path = thirdparty/googletest
 	url = https://github.com/google/googletest
+[submodule "thirdparty/utfcpp"]
+	path = thirdparty/utfcpp
+	url = https://github.com/nemtrif/utfcpp

CMakeLists.txt

@@ -5,7 +5,6 @@ project(libscratchcpp LANGUAGES C CXX)
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
-set(ZIP_SRC thirdparty/zip/src)
 
 option(LIBSCRATCHCPP_BUILD_UNIT_TESTS "Build unit tests" ON)
 option(LIBSCRATCHCPP_NETWORK_SUPPORT "Support for downloading projects" ON)
@@ -16,8 +15,6 @@ if (NOT (CMAKE_CXX_COMPILER_ID STREQUAL "GNU"))
 	set(LIBSCRATCHCPP_COMPUTED_GOTO OFF CACHE BOOL "" FORCE)
 endif()
 
-find_package(utf8cpp REQUIRED)
-
 add_library(scratchcpp SHARED)
 add_subdirectory(src)
 include_directories(src) # TODO: Remove this line
@@ -66,21 +63,23 @@ target_sources(scratchcpp
 )
 
 include(FetchContent)
+set(ZIP_SRC thirdparty/zip/src)
+set(UTFCPP_SRC thirdparty/utfcpp/source)
 
 add_library(zip SHARED
 	${ZIP_SRC}/zip.c
 	${ZIP_SRC}/zip.h
 	${ZIP_SRC}/miniz.h
 )
-include_directories(thirdparty/zip/src)
+target_include_directories(scratchcpp PUBLIC ${ZIP_SRC})
 
+target_include_directories(scratchcpp PUBLIC ${UTFCPP_SRC})
 include_directories(thirdparty/spimpl)
 
 FetchContent_Declare(json URL https://github.com/nlohmann/json/releases/download/v3.11.3/json.tar.xz)
 FetchContent_MakeAvailable(json)
 
 target_link_libraries(scratchcpp PRIVATE nlohmann_json::nlohmann_json)
-target_link_libraries(scratchcpp PRIVATE utf8cpp)
 target_link_libraries(scratchcpp PRIVATE zip)
 target_link_libraries(scratchcpp PRIVATE scratchcpp-audio)