Dependency update / fixes / skrungle bungle (#23745)

* Give .props files 2-space indents.

* Move to Central Package Management.

Allows us to store NuGet package versions all in one place. Yay!

* Update NuGet packages and fix code for changes.

Notable:

Changes to ILVerify.
Npgsql doesn't need hacks for inet anymore, now we need hacks to make the old code work with this new reality.
NUnit's analyzers are already complaining and I didn't even update it to 4.x yet.
TerraFX changed to GetLastSystemError so error handling had to be changed.
Buncha APIs have more NRT annotations.

* Remove dotnet-eng NuGet package source.

I genuinely don't know what this was for, and Central Package Management starts throwing warnings about it, so YEET.

* Remove Robust.Physics project.

Never used.

* Remove erroneous NVorbis reference.

Should be VorbisPizza and otherwise wasn't used.

* Sandbox fixes

* Remove unused unit test package references.

Castle.Core and NUnit.ConsoleRunner.

* Update NUnit to 4.0.1

This requires replacing all the old assertion methods because they removed them 🥲

* Oh so that's what dotnet-eng was used for. Yeah ok that makes sense.

* Add Robust.Analyzers.Test

* Update submodule

* commit to re-run CI

Content.Server/Atmos/EntitySystems/GasTileOverlaySystem.cs

@@ -196,7 +196,7 @@ namespace Content.Server.Atmos.EntitySystems
         /// </summary>
         private bool UpdateChunkTile(GridAtmosphereComponent gridAtmosphere, GasOverlayChunk chunk, Vector2i index, GameTick curTick)
         {
-            ref var oldData = ref chunk.GetData(index);
+            ref var oldData = ref chunk.TileData[chunk.GetDataIndex(index)];
             if (!gridAtmosphere.Tiles.TryGetValue(index, out var tile))
             {
                 if (oldData.Equals(default))