Some string changes to reduce some allocations here and there.

[KevinJump]

Some smalls changes, so we do less string allocation in some places. Especially when generating the XML Hash values.

[Copilot]

Pull Request Overview

This PR optimizes string operations to reduce allocations by removing unnecessary case conversions and leveraging case-insensitive comparisons where appropriate.

• Replaced .ToLower() calls with case-insensitive string comparisons and dictionary comparers
• Updated hash generation to use more efficient Convert.ToHexStringLower() method
• Improved variable naming and code formatting consistency

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
uSync.Core/Serialization/SyncSerializerRoot.cs	Removed unnecessary .ToLower() call on XML key attribute
uSync.Core/Serialization/Serializers/ContentSerializer.cs	Added case-insensitive comparer to Dictionary and removed empty line
uSync.Core/Mapping/SyncValueMapperCollection.cs	Used case-insensitive comparer and removed .ToLower() call
uSync.Core/Extensions/XElementExtensions.cs	Replaced string manipulation with Convert.ToHexStringLower() for hash generation
uSync.BackOffice/SyncHandlers/SyncHandlerRoot.cs	Replaced string equality with case-insensitive comparison
uSync.BackOffice/SyncHandlers/Handlers/ContentHandlerBase.cs	Removed .ToLower() calls from match string methods
uSync.AutoTemplates/TemplateWatcher.cs	Improved naming and used case-insensitive comparer for queued items

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