fix: add important properties back to project, import from .props

[Noah Sherwin]

Snyk

Job started: 12 November 2021, 02:52:26
Processed HaloSPV3/SPV3-Loader from GitHub

Found ./src/SPV3.csproj [main]  | No target frameworks detected in ./src/SPV3.csproj
[main] View project 

1 project created
Job completed: 12 November 2021, 02:52:27

[Noah Sherwin]

probably fixed in 880a0a7