Nel

Lots of changes kind of broke the momentum on this issue. Also noting that [RmlUI](https://github.com/mikke89/RmlUi) was discussed in the discord as a long term solution.

Function moved to `SysHierarchy::traverse` in `osp/Active/SysHierarchy.h`. it is currently not used anywhere.

Noting that OSPMagnum.cpp is dead, equivalent file is located in `src/test_application/ActiveApplication.h`

I've already written a better readme in my branch: https://github.com/Capital-Asterisk/osp-magnum/tree/inrepo-docs It's part of PR #89, but it seems like there's some git issues with it.

I'm mostly clueless of what this assert means. It triggers often when creating far-away objects in the Newton world. Nothing bad seems to happen when disabling Newton asserts (`-DDG_DISABLE_ASSERT`) or...

~~**Update**~~ ~~CameraController was de-spaghettified in #161; far simpler than the previous. An 'arcball mode' can be added to it some time later.~~ ~~Associated files:~~ ~~https://github.com/TheOpenSpaceProgram/osp-magnum/blob/40d051ff969a9f4e5feb9cd2c7b61f0e514b2591/src/test_application/activescenes/CameraController.h~~ ~~https://github.com/TheOpenSpaceProgram/osp-magnum/blob/40d051ff969a9f4e5feb9cd2c7b61f0e514b2591/src/test_application/activescenes/CameraController.cpp~~

This sets a few goals. Right now, there's no "set velocity" for the physics engine; this needs to be implemented. Storing velocity data in the Universe is [already possible](https://github.com/TheOpenSpaceProgram/osp-magnum/blob/fbf0a19c2a01fbc0c302a9031fce01ec6b16fc80/src/osp/CoordinateSpaces/CartesianSimple.h#L80) but...

By the looks of it, some of the compilers in the CI don't fully support C++20, and are failing to find some std::ranges functions

Is the longeron++ submodule up to date? I'm pretty sure I fixed this already and updated the submodule. https://github.com/Capital-Asterisk/longeronpp/issues/16 I forgot where exactly, but it's not suppose to be calling...

Fixed long ago