LibGfx: Add start of an ICC profile writer

For now, this can write the profile header.

`icc` refuses to dump its contents since the required copyrightTag,
profileDescriptionTag, and required per-device-class tags are missing,
but it looks ok in a hex editor.

Userland/Libraries/LibGfx/CMakeLists.txt

@@ -28,6 +28,7 @@ set(SOURCES
     Font/WOFF/Font.cpp
     GradientPainting.cpp
     GIFLoader.cpp
+    ICC/BinaryWriter.cpp
     ICC/Profile.cpp
     ICC/Tags.cpp
     ICC/TagTypes.cpp