Add support for Raspbian users

[TheExpertNoob]

general support and some minor code changes for Raspbian users who may want support.

[MestreLion]

Nice!!! Loved it!!!

Question: I'm new to Raspberry Pi world (just bought my first today), trying to understand the original scripts, and in the original files there is another patch to /boot/config.txt adding the line dtoverlay=RetroFlag_pw_io.dtbo (and downloading its corresponding file), which you didn't include for your Raspbian pull request.

What does this file do, and why it isn't necessary in Raspbian?

[m0uh85]

how can I use this script for Raspian?

[TheExpertNoob]

Question: I'm new to Raspberry Pi world (just bought my first today), trying to understand the original scripts, and in the original files there is another patch to /boot/config.txt adding the line dtoverlay=RetroFlag_pw_io.dtbo (and downloading its corresponding file), which you didn't include for your Raspbian pull request.

What does this file do, and why it isn't necessary in Raspbian?

I have no idea. It wasn't needed for Raspbian apparently? At least for this case to work with its buttons.