Bump AvalonEdit from 5.0.4 to 6.1.3.50 in /Source

[dependabot[bot]]

Bumps AvalonEdit from 5.0.4 to 6.1.3.50.

Release notes

Sourced from AvalonEdit's releases.

AvalonEdit 6.1.3

• TFM changes: net6.0-windows (LTS) added
• Expose MarkerPen and MarkerCornerRadius on SearchPanel
• Fix TSQL highlighting where a backslash exists before a single quote literal ('') in a string

AvalonEdit 6.1.2

TFM changes: netcoreapp3.0 removed in favor of netcoreapp3.1 (LTS), net5.0-windows added

AvalonEdit 6.1.1

Fix wrong implementation of attached properties

AvalonEdit 6.1.0

https://github.com/icsharpcode/AvalonEdit/compare/v6.0.1...v6.1.0

AvalonEdit 6.1 Preview

https://github.com/icsharpcode/AvalonEdit/compare/v6.0.1...v6.1-preview1

AvalonEdit 6.0.1

Minor bug fix release

AvalonEdit 6.0

For change details please see CHANGELOG.md. Most notable is the support of .NET Core 3.0.

AvalonEdit 6.0 Preview 1

Built with dotnet-sdk-3.0.100-preview7-012821-win-x64.exe and msbuild version 16.1.76.45076.

Target frameworks: netcoreapp3.0 net40 net45

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