Switch Vezel.Ruptura.Injection to using Vezel.Ruptura.System APIs

[alexrp]

Most of the stuff used in Vezel.Ruptura.Injection can be switched to these APIs now. It's a good way to dogfood those APIs.

The following APIs aren't covered:

• [ ] CreateProcessW
• [ ] CreateRemoteThreadEx
• [ ] GetProcAddress
• [x] IsWow64Process2
• [x] ~~K32GetModuleBaseNameW~~
• [x] OpenProcess (with caller-provided rights)

[alexrp]

This is partially blocked on #15 now.