add "headless" mode where server does not write back to Configuration

[IcculusC]

tl;dr I encountered an issue where the server is writing back to a read only directory in my deployment. I'm providing the configs up front, and don't need them to change. In this PR I have added a "headless" mode gate around the places where the configs are written back to the Configuration files. I am open to suggestions for the name because it's not great.

[github-actions]

Qodana for .NET

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Detected 20 dependencies

Third-party software list

This page lists the third-party software dependencies used in ModernUO

Dependency	Version	Licenses
Argon2.Bindings	1.16.1	MIT
BouncyCastle.Cryptography	2.4.0	MIT
CommunityToolkit.HighPerformance	8.3.2	MIT
LibDeflate.Bindings	1.0.2.120	GPL-3.0-only
MailKit	4.8.0	MIT
Microsoft.Extensions.FileSystemGlobbing	8.0.0	MIT
MimeKit	4.8.0	MIT
ModernUO.CodeGeneratedEvents.Annotations	1.0.0	GPL-3.0-only
ModernUO.CodeGeneratedEvents.Generator	1.0.3.2	GPL-3.0-only
ModernUO.Serialization.Annotations	2.9.1	GPL-3.0-only
ModernUO.Serialization.Generator	2.11.3	GPL-3.0-only
Nerdbank.GitVersioning	3.6.143	MIT
PollGroup	1.5.1	BSD-3-Clause
Serilog.Sinks.Async	2.0.0	Apache-2.0
Serilog.Sinks.Console	6.0.0	Apache-2.0
Serilog	4.0.2	Apache-2.0
System.Formats.Asn1	8.0.1	MIT
System.IO.Hashing	8.0.0	MIT
System.Security.Cryptography.Pkcs	8.0.0	MIT
Zstd.Binaries	1.6.0	MIT

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