Migrate YIO specific files from [cloned buildroot repo](https://github.com/YIO-Remote/buildroot) and create a buildable project. Main goals: - [x] Use buildroot as Git submodule - [x] Use the same buildroot release - [x] Use the same RPI kernel sources - Set remote Git tar release URL as source instead of manually downloaded local file - [x] Build the same binary SD image as with the old project - [x] Create initial master commit to use dev branch for further migrations