Apply R# clean-up for reliability (#877)

* Apply R# clean-up for reliability

- Migrate to NUnit4 Assert.That
- Update dependencise versions
- Fix LangVersion to 9.0 (until net core migration)
- Reformat code
- Apply 'var' style (easier for refactoring)
- Remove redundant parentheses
- Add braces on every condition blocks (1 line)
- Uses new null checking patterns
- Uses AutoProperties when possible
- Uses string scalar type instead of class
- Clean usings
- Add .orig files in git ignore
- Rename some properties to respect defined conventions and US format definition
	- ID -> Id
	- BPM -> Bpm
	- Finish -> End

* Update R# settings according to the clean-up made

VocaluxeLib/CBasic.cs

@@ -39,8 +39,8 @@ namespace VocaluxeLib
         public static IPlaylist Playlist;
 
         public static void Assign(IConfig config, ISettings settings, IThemes themes, IBackgroundMusic backgroundMusic,
-                                  IDrawing draw, IGraphics graphics, IFonts fonts, ILanguage language, IGame game, IProfiles profiles, IRecording record,
-                                  ISongs songs, IVideo video, ISound sound, ICover cover, IDataBase dataBase, IControllers controller, IPlaylist playlist)
+            IDrawing draw, IGraphics graphics, IFonts fonts, ILanguage language, IGame game, IProfiles profiles, IRecording record,
+            ISongs songs, IVideo video, ISound sound, ICover cover, IDataBase dataBase, IControllers controller, IPlaylist playlist)
         {
             Config = config;
             Settings = settings;