Main

- Atari ST: fixes/tweaks in cartridge support.

- PCXT: FDD support, based on AO486 (spark2k06).

- Saturn: rework CD drive (srg320).

- If errors are detected in INI settings display an info message for 5 seconds at core startup (wickerwaka).

- video: Add support for [arcade_vertical] section (wickerwaka).

- input: add support for sdl gamecontrollerdb to setup default mappings (zakk4223).