Refactor Math

[davispuh]

I tried to update nijigenerate to i2d-imgui (see nijigenerate/nijigenerate#84)
Unfortunately it's major PITA because everything's tightly coupled and Luna has no idea how to use Git so it's all massive commit dumps that contain unrelated changes/everything...

Basically one of the commits that updates inochi-creator to i2d-imgui needs this math module.

And I can't cherry-pick just this module because commits contain shitload of other stuff and even this depends on new serializer.

Anyway this implementation comes from these commits:

• Completely overhaul serialization and deserialization - Inochi2D/inochi2d@63fac27
• Fix deserialization - Inochi2D/inochi2d@bc1cb61

[seagetch]

Thanks for the patch.
It seems some functions or classes are duplicated from other file.
For example, struct Transform is defined at source/nijilive/math/transform.d
We need to see what functions are actually missing in nijilive code set.

[davispuh]

Yeah actually those commits deleted those files. I now updated this change to that.
Don't know if it's good idea or not but that's what they did.

Basically import inochi2d.math becomes import inochi2d.core.math

[seagetch]

Sorry, I cannot accept the change that might break with existing code base.
We need to clarify more line-by-line what is actually changed, and whether we should update and accept those commits.

[davispuh]

That's fine, I don't really care but it just makes it simpler to port changes when codebases are similar and not too divergent.

We need to clarify more line-by-line what is actually changed, and whether we should update and accept those commits.

That's tricky... just look at Inochi2D/inochi2d@63fac27 ...

[r888800009]

I think we should first set up proper integration testing, especially for serialization and save/load functionality. nijilive has some transformers and other features that are independent from inochi2d, and these could potentially corrupt users’ project files during save/load — which would be even harder to accept than a simple crash.

For the other parts, most of the UI changes previously didn’t require touching the core function libraries, so those could be resolved through cherry-picking and manual verification.