feat: mark deprecated classes and methods for future removal

[ndorin]

This pull request adds [Obsolete] attributes to several classes, interfaces, methods, and enum members across the codebase. The purpose is to mark these components as deprecated, indicating they are no longer supported and will be removed in a future release. This helps developers avoid using outdated code and prepares the codebase for future clean-up.

Deprecation of core classes and interfaces:

• Marked DebugContext, WebApiPasscodeClient, and the static class ConfigUpdater as obsolete, signaling that these classes are no longer supported and will be removed in a future release. [1] [2] [3]
• Marked the interfaces ILogStrings and ILogStringsWithLevel as obsolete. [1] [2]

Deprecation of device and camera-related components:

• Marked the CameraVisca class as obsolete, instructing users to use the CameraVisca plugin instead.

Deprecation of routing signal types:

• Marked the UsbOutput, UsbInput, and SecondaryAudio members of the eRoutingSignalType enum as obsolete.

Deprecation of methods:

• Marked the SetInterfaces method in DeviceStateMessageBase and the LoadLogoServer method as obsolete, providing guidance on alternative approaches. [1] [2]

[Copilot]

Pull request overview

This PR marks a set of legacy APIs across Essentials/Core as deprecated by adding [Obsolete] attributes (and a few small formatting/tidy changes), helping steer developers away from unsupported components ahead of future removal.

Changes:

• Added [Obsolete] attributes to selected classes/interfaces/methods/enum members across multiple projects.
• Deprecated specific device/routing/logging-related APIs (e.g., CameraVisca, eRoutingSignalType members, ILogStrings*, DebugContext).
• Minor whitespace/formatting updates in touched files (notably ConfigUpdater and WebApiPasscodeClient).

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/PepperDash.Essentials/ControlSystem.cs	Marks LoadLogoServer as obsolete.
src/PepperDash.Essentials.MobileControl.Messengers/Messengers/DeviceStateMessageBase.cs	Marks SetInterfaces as obsolete and adds using System;.
src/PepperDash.Essentials.Devices.Common/Cameras/CameraVisca.cs	Marks CameraVisca as obsolete in favor of plugin usage.
src/PepperDash.Essentials.Core/Routing/eRoutingSignalType.cs	Marks several enum members as obsolete.
src/PepperDash.Essentials.Core/Interfaces/ILogStringsWithLevel.cs	Marks ILogStringsWithLevel as obsolete and formats signature spacing.
src/PepperDash.Essentials.Core/Interfaces/ILogStrings.cs	Marks ILogStrings as obsolete.
src/PepperDash.Essentials.Core/Config/Essentials/ConfigUpdater.cs	Marks ConfigUpdater as obsolete; formatting changes also surfaced a null-check logic bug.
src/PepperDash.Core/WebApi/Presets/WebApiPasscodeClient.cs	Marks class as obsolete; formatting changes surfaced unprofessional comment and event-invocation race pattern.
src/PepperDash.Core/Logging/DebugContext.cs	Marks DebugContext as obsolete.

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