It's now used for both XTEA and ISAAC keys, and there's nothing
XTEA-specific about it so there's no need to duplicate it.
Signed-off-by: Graham <gpe@openrs2.org>
This already caught some cases of public members that should have been
private and one case where the inferred type was too specific.
Signed-off-by: Graham <gpe@openrs2.dev>
Graham