Refactor: Move FileManager to common, add macOS file management support

macos/CMakeLists.txt

@@ -45,6 +45,7 @@ find_library(CARBON_FRAMEWORK Carbon REQUIRED)
 find_library(VIDEOTOOLBOX_FRAMEWORK VideoToolbox REQUIRED)
 find_library(COREMEDIA_FRAMEWORK CoreMedia REQUIRED)
 find_library(COREVIDEO_FRAMEWORK CoreVideo REQUIRED)
+find_library(ICONV_LIBRARY iconv REQUIRED)
 
 target_link_libraries(ghost PRIVATE
     ${COCOA_FRAMEWORK}
@@ -57,6 +58,7 @@ target_link_libraries(ghost PRIVATE
     ${VIDEOTOOLBOX_FRAMEWORK}
     ${COREMEDIA_FRAMEWORK}
     ${COREVIDEO_FRAMEWORK}
+    ${ICONV_LIBRARY}
     "${CMAKE_SOURCE_DIR}/lib/libzstd.a"
 )