Custom cores

[DaRandomCube]

Disclamer
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Is your feature request related to a problem? Please describe.

The default muben64plus provided by lemuroid doesn't support roms higher than 64mb, which is a problem with romhacks like B3313, which takes a 96mb
Chlorobyte, a member of the unabandoned team, built a custom retroarch core that supports high sized roms and a fix for that security bug
However, you cannot use that core because lemuroid doesn't have the ability to install customs

Describe the solution you'd like
A custom cores option with a security warning ofc

Describe alternatives you've considered
Chlorobyte also provides m64ae with that roms support and security fix

Additional context
Add any other context or screenshots about the feature request here.