* remove dotnet-tool.json because the project does not rely on any dotnet tools.
* remove Directory.Build.props because the solution has only one project.
* move src/SourceGit to src. It's not needed to put all sources into a subfolder of src since there's only one project.
* fix Locales.Designer.cs NOT updated when compile after Locale.*.resx changed in Visual Studio 2022.
* use PublicResXFileCodeGenerator instead of ResXFileCodeGenerator to make sure access modifier is 'public' in Visual Studio 2022.
* use ResourceManager.GetResourceSet instead of collecting properties by reflection.
* remove translation warnings in Visual Studio's ResXManager extension.
