Vita3K: Use AppImage instead of Binary package

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• This bundles dependencies with Vita3K instead of depending on system packages
  • This lets Vita3K work ootb on non-SteamOS Distros
  • This also lets Vita3K update dependencies instead of being bound to SteamOS' outdated libraries
• Updated Steam ROM Manager parser to use vita3k.sh
• This is a very low impact PR since the Binary file and AppImage share the same config folders