Allow C# 10 in satellite projects, enable Analyzers on ext. tools

Common.props

@@ -6,7 +6,7 @@
 		<ErrorReport>prompt</ErrorReport>
 		<Features>strict</Features>
 		<IsTargetingNetFramework>$(TargetFramework.StartsWith("net4"))</IsTargetingNetFramework>
-		<LangVersion>9.0</LangVersion>
+		<LangVersion>10.0</LangVersion>
 		<Nullable>enable</Nullable>
 		<PlatformTarget>AnyCPU</PlatformTarget>
 		<RunAnalyzersDuringBuild Condition=" '$(MachineRunAnalyzersDuringBuild)' == '' ">false</RunAnalyzersDuringBuild>

ExternalToolProjects/ExtToolCommon.props

@@ -3,6 +3,7 @@
 	<PropertyGroup>
 		<CodeAnalysisRuleSet>$(ProjectDir)../../Common.ruleset</CodeAnalysisRuleSet>
 		<OutputPath>$(ProjectDir)bin/$(Configuration)/</OutputPath>
+		<RunAnalyzersDuringBuild>true</RunAnalyzersDuringBuild>
 	</PropertyGroup>
 	<ItemGroup>
 		<AdditionalFiles Include="$(ProjectDir)../../.stylecop.json" />

src/BizHawk.Version/BizHawk.Version.csproj

@@ -5,6 +5,7 @@
 	<Import Project="../../Common.props" />
 	<PropertyGroup>
 		<EnableDefaultCompileItems>false</EnableDefaultCompileItems><!-- no source files; only runs below target to write ../BizHawk.Common/VersionInfo.gen.cs -->
+		<LangVersion>9.0</LangVersion>
 		<NoWarn>$(NoWarn);CS2008</NoWarn>
 	</PropertyGroup>
 	<Target Name="PreBuild" AfterTargets="PreBuildEvent">

src/MainSlnCommon.props

@@ -5,6 +5,7 @@
 		<CodeAnalysisRuleSet>$(ProjectDir)../../Common.ruleset</CodeAnalysisRuleSet>
 		<DefineConstants>$(DefineConstants);AVI_SUPPORT</DefineConstants>
 		<DocumentationFile>$(ProjectDir)bin/doc_comments.xml</DocumentationFile>
+		<LangVersion>9.0</LangVersion>
 		<MSBuildWarningsAsMessages>NU1702</MSBuildWarningsAsMessages>
 		<NoWarn>CS1573;CS1591</NoWarn>
 		<OutputPath>$(ProjectDir)../../output/dll</OutputPath>