Added the Blackholio Unreal Blueprint Tutorial

[JasonAtClockwork]

Description of Changes

Closes: https://github.com/clockworklabs/SpacetimeDBPrivate/issues/2073

• Expanded on the Unreal tutorial to create the Blueprint version, this uses :::server-cpp and :::server-blueprint which might not work yet when deploying.
• Updated the server side code to use signed integers as discussed for both Rust + C# server modules.

API and ABI breaking changes

None

Expected complexity level and risk

1 - Documentation update, does update the server side

Testing

• Manually tested both Rust + C# modules
• Ran through all images and steps

[JasonAtClockwork]

The Unreal documentation has been updated but I need to fix up the Unity documentation to use signed integers as well as fix up the Blackholio demos all to use signed integers.

[JasonAtClockwork]

Ready for review but not pushed to staging yet as we'll need to discuss the images and the new ::: setup I've used

[rekhoff]

The C++ and Blueprint documentation toggle all appear to use server-cpp and server-blueprint. This seems to imply the server either uses C++ or Blueprints to run, but contain instructions pertaining to the client. We likely want to change these to client-cpp and client-blueprint or possibly client-ucpp to indicate this is Unreal C++ and not general C++.

[JasonAtClockwork]

100% I'm actually working on this right now as I've got it running locally and :::server-rust is competing with :::server-cpp as an example. Even changing to :::client-cpp isn't working so I'm diagnosing now!

[rekhoff]

If we are creating a Blueprint project, should we still generate the project as a C++ as shown here

SpacetimeDB/docs/docs/unreal/part-1.md

Line 44 in 5420d14



or should Blueprint be selected?
If we should still select C++ in the Project Defaults, we may want to have a note or something, so folks going down the Blueprint path, don't generate the project as a Blueprint project out of habit.

[JasonAtClockwork]

If we are creating a Blueprint project, should we still generate the project as a C++ as shown here

SpacetimeDB/docs/docs/unreal/part-1.md

Line 44 in 5420d14



or should Blueprint be selected?
If we should still select C++ in the Project Defaults, we may want to have a note or something, so folks going down the Blueprint path, don't generate the project as a Blueprint project out of habit.

Yes we will want all projects to start as C++, the reason is we're generating C++ code from the module into the project so might as well start them off on the right foot.

I'll make sure to get an extra note in there!