enable parallel analyzer execution

docs/technical/mod-package.md

@@ -365,7 +365,10 @@ The NuGet package is generated automatically in `StardewModdingAPI.ModBuildConfi
 when you compile it.
 
 ## Release notes
-## 3.3
+## Upcoming release
+* Improved analyzer performance by enabling parallel execution.
+
+## 3.3.0
 Released 30 March 2021.
 
 * Added a build warning when the mod isn't compiled for `Any CPU`.
@@ -385,19 +388,19 @@ Released 11 September 2020.
 * Added more detailed logging.
 * Fixed _path's format is not supported_ error when using default `Mods` path in 3.2.
 
-### 3.2
+### 3.2.0
 Released 07 September 2020.
 
 * Added option to change `Mods` folder path.
 * Rewrote documentation to make it easier to read.
 
-### 3.1
+### 3.1.0
 Released 01 February 2020.
 
 * Added support for semantic versioning 2.0.
 * `0Harmony.dll` is now ignored if the mod references Harmony directly (it's bundled with SMAPI).
 
-### 3.0
+### 3.0.0
 Released 26 November 2019.
 
 * Updated for SMAPI 3.0 and Stardew Valley 1.4.
@@ -412,14 +415,14 @@ Released 26 November 2019.
 * Dropped support for older versions of SMAPI and Visual Studio.
 * Migrated package icon to NuGet's new format.
 
-### 2.2
+### 2.2.0
 Released 28 October 2018.
 
 * Added support for SMAPI 2.8+ (still compatible with earlier versions).
 * Added default game paths for 32-bit Windows.
 * Fixed valid manifests marked invalid in some cases.
 
-### 2.1
+### 2.1.0
 Released 27 July 2018.
 
 * Added support for Stardew Valley 1.3.
@@ -439,7 +442,7 @@ Released 11 October 2017.
 
 * Fixed mod deploy failing to create subfolders if they don't already exist.
 
-### 2.0
+### 2.0.0
 Released 11 October 2017.
 
 * Added: mods are now copied into the `Mods` folder automatically (configurable).
@@ -457,7 +460,7 @@ Released 28 July 2017.
 * The manifest/i18n files in the project now take precedence over those in the build output if both
   are present.
 
-### 1.7
+### 1.7.0
 Released 28 July 2017.
 
 * Added option to create release zips on build.
@@ -474,19 +477,19 @@ Released 09 July 2017.
 
 * Improved crossplatform game path detection.
 
-### 1.6
+### 1.6.0
 Released 05 June 2017.
 
 * Added support for deploying mod files into `Mods` automatically.
 * Added a build error if a game folder is found, but doesn't contain Stardew Valley or SMAPI.
 
-### 1.5
+### 1.5.0
 Released 23 January 2017.
 
 * Added support for setting a custom game path globally.
 * Added default GOG path on macOS.
 
-### 1.4
+### 1.4.0
 Released 11 January 2017.
 
 * Fixed detection of non-default game paths on 32-bit Windows.
@@ -494,22 +497,22 @@ Released 11 January 2017.
 * Removed support for overriding the target platform (no longer needed since SMAPI crossplatforms
   mods automatically).
 
-### 1.3
+### 1.3.0
 Released 31 December 2016.
 
 * Added support for non-default game paths on Windows.
 
-### 1.2
+### 1.2.0
 Released 24 October 2016.
 
 * Exclude game binaries from mod build output.
 
-### 1.1
+### 1.1.0
 Released 21 October 2016.
 
 * Added support for overriding the target platform.
 
-### 1.0
+### 1.0.0
 Released 21 October 2016.
 
 * Initial release.

src/SMAPI.ModBuildConfig.Analyzer/NetFieldAnalyzer.cs

@@ -174,6 +174,9 @@ namespace StardewModdingAPI.ModBuildConfig.Analyzer
         /// <param name="context">The analysis context.</param>
         public override void Initialize(AnalysisContext context)
         {
+            context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.Analyze | GeneratedCodeAnalysisFlags.ReportDiagnostics);
+            context.EnableConcurrentExecution();
+
             context.RegisterSyntaxNodeAction(
                 this.AnalyzeMemberAccess,
                 SyntaxKind.SimpleMemberAccessExpression,

src/SMAPI.ModBuildConfig.Analyzer/ObsoleteFieldAnalyzer.cs

@@ -56,6 +56,9 @@ namespace StardewModdingAPI.ModBuildConfig.Analyzer
         /// <param name="context">The analysis context.</param>
         public override void Initialize(AnalysisContext context)
         {
+            context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.Analyze | GeneratedCodeAnalysisFlags.ReportDiagnostics);
+            context.EnableConcurrentExecution();
+
             context.RegisterSyntaxNodeAction(
                 this.AnalyzeObsoleteFields,
                 SyntaxKind.SimpleMemberAccessExpression,