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/PartyModes/CPartyModeNormal.cs

@@ -15,7 +15,6 @@
 // along with Vocaluxe. If not, see <http://www.gnu.org/licenses/>.
 #endregion
 
-using System;
 using VocaluxeLib.Menu;
 
 namespace VocaluxeLib.PartyModes
@@ -65,10 +64,10 @@ namespace VocaluxeLib.PartyModes
             _ScreenSongOptions.Selection.SongIndex = -1;
             _ScreenSongOptions.Selection.CategoryIndex = -1;
 
-            _ScreenSongOptions.Sorting.SearchString = String.Empty;
+            _ScreenSongOptions.Sorting.SearchString = string.Empty;
             _ScreenSongOptions.Sorting.SearchActive = false;
             _ScreenSongOptions.Sorting.DuetOptions = EDuetOptions.All;
-            _ScreenSongOptions.Sorting.FilterPlaylistID = -1;
+            _ScreenSongOptions.Sorting.FilterPlaylistId = -1;
         }
 
         public override bool Init()
@@ -76,7 +75,7 @@ namespace VocaluxeLib.PartyModes
             return true;
         }
 
-        public override void UpdateGame() {}
+        public override void UpdateGame() { }
 
         public override IMenu GetStartScreen()
         {
@@ -89,16 +88,18 @@ namespace VocaluxeLib.PartyModes
             _ScreenSongOptions.Sorting.Tabs = CBase.Config.GetTabs();
 
             if (_ScreenSongOptions.Sorting.SearchActive)
+            {
                 _ScreenSongOptions.Sorting.Tabs = EOffOn.TR_CONFIG_OFF;
+            }
 
             _ScreenSongOptions.Sorting.IgnoreArticles = CBase.Config.GetIgnoreArticles();
 
             return _ScreenSongOptions;
         }
 
-        public override void OnSongChange(int songIndex, ref SScreenSongOptions screenSongOptions) {}
+        public override void OnSongChange(int songIndex, ref SScreenSongOptions screenSongOptions) { }
 
-        public override void OnCategoryChange(int categoryIndex, ref SScreenSongOptions screenSongOptions) {}
+        public override void OnCategoryChange(int categoryIndex, ref SScreenSongOptions screenSongOptions) { }
 
         public override void SetSearchString(string searchString, bool visible)
         {
@@ -106,7 +107,7 @@ namespace VocaluxeLib.PartyModes
             _ScreenSongOptions.Sorting.SearchActive = visible;
         }
 
-        public override void SongSelected(int songID)
+        public override void SongSelected(int songId)
         {
             CBase.Graphics.FadeTo(EScreen.Sing);
         }