[Refactor] Migrate Windows functions to the windows crate

[mttaggart]

This is a big lift, but once done, the Windows components will be much more ergonomic.

• [x] elevate.rs
• [x] getprivs.rs
• [x] inject.rs
• [x] selfdestruct.rs

[HuskyHacks]

Impl in https://github.com/mttaggart/OffensiveNotion/commits/dev