[Feature] Migration to Arduino 3.x.x #193
Description
Branch: https://github.com/BlueAndi/Pixelix/tree/feature/Arduino3.x.x
Problems found during migration:
- Development boards with 4 MB flash run out of flash space. The only idea at the moment is to remove OTA for them, but for the Ulanzi device this is very bad, because updating over USB is not working well.