Hollowed references

[seionmoya]

Switches from git submodules to hollowing all dlls.

Advantages

• Simplified update process
• CI/CD works on external forks
• All users benefit (not only internal)

Considerations

• Relies on an external tool (like BatchHollower) to hollow the referenced assemblies.

Notes

Update process changed; instead of using git submodules, you now hollow the dlls (to remove the method bodies of all types in the dlls), and drop them in the References/ folder.
This way no copyrighted code is shipped while still being signature compatible.
This is also what SPT is doing for Assembly-CSharp.dll (see hollowed.dll).