Instead, we can make it part of the type and make named variables for
them, so they only require one definition (and if they ever change for
whatever reason, they only need to be changed in one spot).

Given the VirtualFile instance isn't stored into the class as a data
member, or written to, this can just be turned into a const reference,
as the constructor doesn't need to make a copy of it.

Orders the members in the exact order they would be initialized. This
also prevents compiler warnings about this sort of thing.

Gets unused includes out of the headers and moves them into the cpp file
if they're used there instead.

x

Keeps track of system files for key derivation