In older versions of Dolphin GraphicsBoolEx was used to create a pair of
radio buttons selecting one of Virtual XFB and Real XFB, but this was
removed with the introduction of Hybrid XFB in 65cd085f.
In the meantime GraphicsRadioInt was introduced to allow for Graphics
radio buttons with multiple options, so GraphicsBoolEx is now redundant.
SPDX standardizes how source code conveys its copyright and licensing
information. See https://spdx.github.io/spdx-spec/1-rationale/ . SPDX
tags are adopted in many large projects, including things like the Linux
kernel.
