v2.1 FOR RECALBOX 8.1+

• Add cdi support
• Add megaduck support
• Fix game list from bbcmicro system
• Fix missing frogger game from dragon system
• Fix game list from ti994a system
• Fix missing frogger game from zx81 system
• Fix frogger color accent
• Fix thexder game id from various systems
• Fix naomigd mix was not using right arcade assets
• Fix typo in neogeocd texts
• Update game by genre game lists
• Remove unofficial system support