infra: Migrate to .NET 7 (#3795)

* Update readme to mention .NET 7

* infra: Migrate to .NET 7

.NET 7 is still in preview but this prepare for the release coming up
next month.

* Use Random.Shared in CreateRandom

* Move UInt128Utils.cs to Ryujinx.Common project

* Fix inverted parameters in System.UInt128 constructor

* Fix Visual Studio complains on  Ryujinx.Graphics.Vic

* time: Fix missing alignment enforcement in SystemClockContext

Fixes at least Smash

* time: Fix missing alignment enforcement in SteadyClockContext

Fix games (like recent version of Smash) using time shared memory

* Switch to .NET 7.0.100 release

* Enable Tiered PGO

* Ensure CreateId validity requirements are meet when doing random generation

Also enforce correct packing layout for other Mii structures.

This fix a Mario Kart 8 crashes related to the default Miis.

Ryujinx.HLE/HOS/Services/Ssl/SslService/SslManagedSocketConnection.cs

@@ -66,6 +66,8 @@ namespace Ryujinx.HLE.HOS.Services.Ssl.SslService
             EndSslOperation();
         }
 
+// NOTE: We silence warnings about TLS 1.0 and 1.1 as games will likely use it.
+#pragma warning disable SYSLIB0039
         private static SslProtocols TranslateSslVersion(SslVersion version)
         {
             switch (version & SslVersion.VersionMask)
@@ -84,6 +86,7 @@ namespace Ryujinx.HLE.HOS.Services.Ssl.SslService
                     throw new NotImplementedException(version.ToString());
             }
         }
+#pragma warning restore SYSLIB0039
 
         public ResultCode Handshake(string hostName)
         {