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/Enums.cs

@@ -203,10 +203,8 @@ namespace VocaluxeLib
     public enum ESongMenu
     {
         // ReSharper disable InconsistentNaming
-        TR_CONFIG_LIST,       // list of covers and artist - title
-        //TR_CONFIG_DREIDEL,  //as in ultrastar deluxe
+        TR_CONFIG_LIST, // list of covers and artist - title
         TR_CONFIG_TILE_BOARD, //chessboard like
-        //TR_CONFIG_BOOK      //for playlists
         // ReSharper restore InconsistentNaming
     }
 
@@ -458,4 +456,4 @@ namespace VocaluxeLib
         TR_USERROLE_PROFILEEDITOR = 32
         // ReSharper restore InconsistentNaming
     }
-}
+}