zxing-cpp: strip to core library only (remove tests/wrappers/examples/docs); .gitignore: fix /core to allow zxing-cpp/core/ dir

tools/chatgui/zxing-cpp/docs/CMakeLists.txt

@@ -1,29 +0,0 @@
-cmake_minimum_required(VERSION 3.16)
-
-project(ZXingDocs VERSION 3.1.0)
-
-find_package(Doxygen)
-
-if(DOXYGEN_FOUND)
-    include(FetchContent)
-    FetchContent_Declare(
-        doxygen-awesome-css
-        URL https://github.com/jothepro/doxygen-awesome-css/archive/refs/heads/main.zip
-        DOWNLOAD_EXTRACT_TIMESTAMP TRUE
-    )
-    FetchContent_MakeAvailable(doxygen-awesome-css)
-
-    # Save the location the files were cloned into
-    # This allows us to get the path to doxygen-awesome.css
-    FetchContent_GetProperties(doxygen-awesome-css SOURCE_DIR AWESOME_CSS_DIR)
-
-    # Generate the Doxyfile
-    set(DOXYFILE_IN ${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile.in)
-    set(DOXYFILE_OUT ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile)
-    configure_file(${DOXYFILE_IN} ${DOXYFILE_OUT} @ONLY)
-
-    add_custom_target(docs
-        COMMAND ${DOXYGEN_EXECUTABLE} ${DOXYFILE_OUT}
-        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-        VERBATIM)
-endif()