RetroAchievements bug fixes and adjustments

[OFFTKP]

• notification redesign
• ~~rare unlocked achievements now glow~~ removed for now
• fix overlapping text in dual boxes
• dual box label now shows rarity of achievement with different colors based on rarity
• rich presence fixed
• fix crash due to deletes happening mid-render on rare occasions
• move panel drawing to main.c
• handle eeprom gba stuff (untested, idk of games that use eeprom in achievements)
• moved atlas stuff to its own cpp file
• user image shows
• encore mode
• other stuff that I forgot