clang-format all src files.
Merge branch 'master' of https://github.com/wutipong/pgnovel

Conflicts:
	src/TestVisualNovelScene.h
	src/visual_novel/MessageBox.cpp
	src/visual_novel/MessageBox.h
	src/visual_novel/MessageCommand.cpp
	src/visual_novel/MessageCommand.h
format code once more.