[Xaleee]

1. Added ERC4626 vault with all functionality, 2 wraps and 2 unwraps for full freedom to users and all roundings in favor of the vault.
2. Added integration inside Multiverse for fully functional interconnection (except some forking parts).
3. Fixed previous tests failing.
4. Added some very basic tests for the ERC4626.

[viatrix]

The migration functionality is not here yet, will be added later.
Will be added later:

During forking: no wrapping into parent wREP, but depositing parent REP and getting child wREP.
Migration of parent wREP to wREP of preferred child (internally in Lituus).
Being able to move "dead funds" ourselves for auction.