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/Log/ShowReporterDelegate.cs

@@ -26,4 +26,4 @@ namespace VocaluxeLib.Log
     /// <param name="log">The log to submit.</param>
     /// <param name="lastError">The last error message.</param>
     public delegate void ShowReporterDelegate(bool crash, bool showContinue, string vocaluxeVersionTag, string log, string lastError);
-}
+}