AltF
Returns current_alternative for use in ColorSelect<>, TrSelect<> or IntSelect<>
SyncAltToVarianceF, SyncAltToVarianceL, ColorSelect, TrSelect, IntSelect
https://github.com/profezzorn/ProffieOS/blob/6f8add544c627172ad2dd698c90e5e55078a420a/functions/alt.h#L7