Missing helpers for NovelRT::Ecs::Graphics

[RubyNova]

This ticket is mostly just a bit of bulk work, and should be doable by anyone who can understand basic C and basic C++.

There is currently no well-defined C shim for simplifying access to the default graphics support within NovelRT::Ecs. This means that:

• it is currently impossible to attach the default rendering system to a SystemScheduler from C
• it is currently impossible to get the correct component type ID for the rendering components
• even if it were possible, the barebones C API for ECS means it would be cumbersome to use.

For something that is well-defined as this in the C++ API I believe that we should probably support the above behaviours in C also. This may or may not involve:

• making C-compliant versions of POD types for type punning
• opaque handles to complex types such as the default rendering system
• making C functions to register the default rendering components internally via C++ and caching the IDs so they can be returned via another C function (or by the same one)

[ActualDio]

Ill work on it

[RubyNova]

Issue is open again after user was banned.

[NullSapphire]

I'll start working on it

[DynamicField]

I'll work on it (trust me, I will!!)