Modernize NuGet dependencies and migrate to PackageReference (#823)

* Add .vscode to .gitignore

* Update copyright year

* Update Newtonsoft.Json package to version 13.0.4

* Migrate NuGet to PackageReference

* Replace vocaluxe.dependencies.sqlite with Microsoft.Data.Sqlite

* Update Serilog package references to latest versions

* Fix typo

.gitignore

@@ -3,6 +3,7 @@ PitchTracker.dll
 Thumbs.db
 .transifexrc
 .vs
+.vscode
 tx.exe
 *.mp4
 *.pdb