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.Database/ModelSqlite.cs

@@ -9,6 +9,7 @@ using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Diagnostics;
 using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using NpgsqlTypes;
 
 namespace Content.Server.Database
 {
@@ -48,8 +49,8 @@ namespace Content.Server.Database
                 .Property(p => p.LastSeenAddress)
                 .HasConversion(ipConverter);
 
-            var ipMaskConverter = new ValueConverter<(IPAddress address, int mask), string>(
-                v => InetToString(v.address, v.mask),
+            var ipMaskConverter = new ValueConverter<NpgsqlInet, string>(
+                v => InetToString(v.Address, v.Netmask),
                 v => StringToInet(v)
             );
 
@@ -98,11 +99,11 @@ namespace Content.Server.Database
             return $"{address}/{mask}";
         }
 
-        private static (IPAddress, int) StringToInet(string inet) {
+        private static NpgsqlInet StringToInet(string inet) {
             var idx = inet.IndexOf('/', StringComparison.Ordinal);
-            return (
+            return new NpgsqlInet(
                 IPAddress.Parse(inet.AsSpan(0, idx)),
-                int.Parse(inet.AsSpan(idx + 1), provider: CultureInfo.InvariantCulture)
+                byte.Parse(inet.AsSpan(idx + 1), provider: CultureInfo.InvariantCulture)
             );
         }