* tooltip for swap button
* move `Views.CompareTargetWorktree` to `Models.CompareTargetWorktree`
* remove unused `Models.IObjectId`
* fix swap not working when target is Worktree, because Commands.CompareRevisions's Args do not changed after swapping
* 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.