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

PartyModes/PartyModeChallenge/PartyModeChallenge.csproj

@@ -27,6 +27,7 @@
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
     <CodeAnalysisRuleSet>..\..\CheckingRules.ruleset</CodeAnalysisRuleSet>
     <Prefer32Bit>false</Prefer32Bit>
+    <LangVersion>9.0</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'ReleaseWin|AnyCPU'">
     <PlatformTarget>AnyCPU</PlatformTarget>
@@ -40,6 +41,7 @@
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
     <Prefer32Bit>false</Prefer32Bit>
     <DebugSymbols>true</DebugSymbols>
+    <LangVersion>9.0</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'DebugLinux|AnyCPU'">
     <PlatformTarget>AnyCPU</PlatformTarget>
@@ -52,6 +54,7 @@
     <WarningLevel>4</WarningLevel>
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
     <Prefer32Bit>false</Prefer32Bit>
+    <LangVersion>9.0</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'ReleaseLinux|AnyCPU'">
     <PlatformTarget>AnyCPU</PlatformTarget>
@@ -65,6 +68,7 @@
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
     <Prefer32Bit>false</Prefer32Bit>
     <DebugSymbols>true</DebugSymbols>
+    <LangVersion>9.0</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'InstallerWin|AnyCPU'">
     <OutputPath>bin</OutputPath>
@@ -78,6 +82,7 @@
     <Prefer32Bit>false</Prefer32Bit>
     <DebugType>pdbonly</DebugType>
     <DebugSymbols>true</DebugSymbols>
+    <LangVersion>9.0</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="CChallengeRounds.cs" />
@@ -119,4 +124,4 @@ rm -f "$(SolutionDir)Output\PartyModes\$(TargetName)\Code\GlobalSuppressions.cs"
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>