Draft: Open the dialog by shortcut and open dialog by an Intent broadcast

I think the users of my app Key Mapper will appreciate this feature. A lot of people are using this app and some people have been asking to be able to do this on non-rooted Android 8.1+ devices with Key Mapper because Google blocked the ability for apps to show the keyboard picker when they are in the background. I thought I would just make it possible for Key Mapper to interface with this app rather than reinvent the wheel. You probably already know this, but starting the keyboard switcher activity only works if the app has the SYSTEM_ALERT_WINDOW permission on Android 10+.

This is a great app and I didn't know it was open source as well! 😀