qt_common: Move window info function out of bootmanager

Function is useful outside of bootmanager, so put it in a common place.

qt_common: Add missing include

qt_common: Add some newlines

qt_common: Add trailing newline

qt_common: Add trainline newline

src/yuzu/CMakeLists.txt

@@ -189,6 +189,8 @@ add_executable(yuzu
     multiplayer/state.h
     multiplayer/validation.h
     precompiled_headers.h
+    qt_common.cpp
+    qt_common.h
     startup_checks.cpp
     startup_checks.h
     uisettings.cpp