Filetypes missing from Atari 800/xegs

[a8bit]

Concerned project

Standalone emulationstation

Distribution Version

Knulli on RG35xxSP

Architecture

Arm

Issue description

es_systems.cfg should have filetypes .xex and .atx for Atari 800 and XEGS.

Also there should be an AtariXL system, there are three types of Atari 8bit, just like there are three types of Commodore Amiga. The Atari systems are Atari 800 (the 400/800) Atari XL (the 600XL, 800XL) and the XEGS (Atari 130XE, XEGS). They all have different configurations even though they are mostly backwards compatible. The 400/800 were mostly NTSC with an early bios, the XL series was mostly PAL with 64K and a newer bios and the XE series was mostly PAL with 128K and a newer bios and BASIC version. These systems should all have in es_systems so they can appear as a single item.

Logs and data

No response