Implement remaining shadow code

[jonwil]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 1104 lines in your changes are missing coverage. Please review.

Comparison is base (24d413c) 2.69% compared to head (6af3c60) 2.66%.
Report is 1 commits behind head on develop.

Files	Patch %	Lines
...rm/w3dengine/client/shadow/w3dvolumetricshadow.cpp	0.00%	667 Missing ⚠️
src/platform/w3dengine/client/w3dview.cpp	0.00%	339 Missing ⚠️
src/platform/w3dengine/client/shadow/w3dshadow.cpp	0.00%	82 Missing ⚠️
...form/w3dengine/client/shadow/w3dvolumetricshadow.h	0.00%	7 Missing ⚠️
src/platform/w3dengine/client/w3dview.h	0.00%	4 Missing ⚠️
...rm/w3dengine/client/drawable/draw/w3dmodeldraw.cpp	0.00%	2 Missing ⚠️
src/platform/w3dengine/client/w3dingameui.cpp	0.00%	2 Missing ⚠️
...orm/w3dengine/client/shadow/w3dprojectedshadow.cpp	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1042      +/-   ##
===========================================
- Coverage     2.69%    2.66%   -0.03%     
===========================================
  Files          919      921       +2     
  Lines       103723   104832    +1109     
  Branches     17579    17793     +214     
===========================================
+ Hits          2797     2799       +2     
- Misses      100522   101629    +1107     
  Partials       404      404              

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[xezon]

Shadows from airborne objects are glitching in Shell Map.

I removed all hooks that this change has added and it still happens.

[xezon]

Tested in one session with

• Shell Map
• A few Skirmish maps
• Test map with all faction objects

Shadow length and direction looks identical.

No crashes. No issues with Shadows found.