Ego-Lane-Derived-Digests for Privatizations: `ProtectionBasedTIDPriv`

[michael-schwarz]

Introduces one of the new privatizations which will need to be evaluated for my thesis. This might actually be a lightweight interesting instance that might be worth evaluating it in practice.

This takes the protection based analysis and replaces [g] and [g]' by [g,A] and [g,A]' respectively, where A is an ego-lane derived digest.

Implementation-wise we once more use the Reduced-Cardinal-Powerset construction and change types of unknowns from ValD to partial maps Digest -> ValD with default value bot.

TODO:

• [x] Add new interesting tests
• [x] Modify TID.is_must_parent. Currently, this is reflexive, which is against intuition (I rarely think of myself as my own father)

[michael-schwarz]

I was able to cast this as a generic lifter, which means we get no additional code duplication here :smile: