Update SigComparer and EqualityComparers
Update SigComparer and EqualityComparers

- Add CompareTypeScope flag
- Remove public from methods that shouldn't be public

picrap/dnlib,jorik041/dnlib,0xd4d/dnlib,kiootic/dnlib,modulexcite/dnlib,yck1509/dnlib,ilkerhalil/dnlib,Arthur2e5/dnlib,ZixiangBoy/dnlib