Phobos Voxel turret & multi-section shadow reimplementation

Originally authored by @chaserli

Attempt to fix the math of shadow projection (turrets being off kilter etc).
Attempt to make multi-section shadows consider frame index.
Fix shadow flickering with multi-section voxels using the HVA transform section swap method.
Airborne voxel shadow scaling.

TODO:

Regression tests with lots of voxels
Doc

Update from @chaserli 02/29:

Considered Ares turrets/barrels, fixed wrong voxel selection especially in charging turret cases
Added 2 new tags for the hva frame of each you want to render the shadow.
- If you only want to render the ShadowIndex as usual but the VXL used the socalled hva section swap method, then naturally the hva matrix for the first frame is not null, so ShadowIndex.Frame is default to 0
  - If you set ShadowIndex to an invalid number the body's shadow will not be rendered, just for fail-safe, but you can exploit that since the turret will still do since the index for it is always 0
- For multiple indices the default value is -1 since perhaps you want them to animate
Mathematically speaking there's no solution for the projection, but it's been tested that it's possible to just adjust the vxl and get a visually appropriate shadow

Update from @chaserli 03/05:

Add a simple method for calculating the shadow projection on the ground when being flipped
Dynamic scaling is restored, provided you invalidate the cache, yeah
Took NoSpawnAlt vxl from Ares into account, ehh I'll hand over the rest to you @Starkku , bonne chance. What I suggest:
Make a compromise between caching and dynamic scaling for aircrafts
Try if it's possible to cache the turret shadow, or prove it's not a potential perf issue
Extensive regression tests, compare if the shadow even for the body locates differently than before, in air and on ground, since I didn't do the height check since IDK what's actually going on in there

Feb 24 '24 13:02 Starkku

Walkthrough

The recent modifications involve enhancing shadow rendering and data structure optimization for TechnoType entities. Specifically, shadow indices are now managed more efficiently with a shift from vectors to a map, facilitating better alignment and access. Additionally, the handling of shadows has been refined to accommodate frame-specific rendering, alongside adjustments in matrix operations and conditional logic for improved visual fidelity in game components.

Changes

Files	Change Summary
`.../TechnoType/Body.cpp`	Updated `ShadowIndices` handling, added `ShadowIndex_Frame` processing, and `ShadowSizeCharacteristicHeight` handling.
`.../TechnoType/Body.h`	Restructured `ShadowIndices` to `std::map<int, int>`, introduced `ShadowIndex_Frame` and `ShadowSizeCharacteristicHeight`.
`.../TechnoType/Hooks.cpp`	Adjusted matrix operations, turret offsets, and shadow rendering logic for improved unit shadow rendering.

🐇✨
In the realm of code, where shadows play,
A rabbit hopped, making changes today.
From vectors to maps, in structures so deep,
Ensuring the shadows, in memory, we keep.
With each line refined, and bugs kept at bay,
A hop, skip, and jump, we're on our way!
🌟🐾

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Feb 24 '24 13:02 coderabbitai[bot]

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