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/CEncoding.cs

@@ -42,13 +42,17 @@ namespace VocaluxeLib
 
         public static string GetEncodingName(this Encoding enc)
         {
-            string result = "UTF8";
+            var result = "UTF8";
 
             if (enc.CodePage == 1250)
+            {
                 result = "CP1250";
+            }
 
             if (enc.CodePage == 1252)
+            {
                 result = "CP1252";
+            }
 
             return result;
         }