Orange app
Orange is Xposed tool that is open source under the GPL-3.0-only license.Orange is a Xposed module that support to specify orientation per app, which is useful for some app that need specified orientation to get better experience (such as MAME4droid).
Note: The module config uses content provider, which needs the permissions of autostart and running in the backgraound, otherwise it will not work properly.
After installing the module, set up these permissions via app info setting page.