Respect the function owner when calling a function from Lua

[micheljung]

I want to achieve this:

UShipLuaComponent::UShipLuaComponent()
{
  Table.Add("GetActorLocation", FLuaValue::Function(GET_FUNCTION_NAME_CHECKED(UShipLuaComponent, GetActorLocation)));
}

FLuaValue UShipLuaComponent::GetActorLocation() {
  ...
}

And then have this

self.GetActorLocation()

To call the function on the component.

However, this currently calls AShip::GetActorLocation() instead of UShipLuaComponent::GetActorLocation().

This seems to be by design.

The downside is that the owning component now needs to declare Lua-compatible functions, leading to tight coupling.

With the suggested change, the user can instead use FunctionOfObject:

Table.Add("GetActorLocation", FLuaValue::FunctionOfObject(this, GET_FUNCTION_NAME_CHECKED(UShipLuaComponent, GetActorLocation)));

And have the function called on the component instead of the owner. This change is backward-compatible.

[micheljung]

I think the code is OK, but I'm not yet sure how to get the component instance. With what I'm doing currently, I get NULL for GetOwner().

Let's put this on hold until I figured this out.