net8.0: upgrade from netcoreapp3.1, fix Linux rendering

- TFM: netcoreapp3.1 → net8.0, netstandard2.1 → net8.0
- System.Drawing.Common 5.0.3 → 6.0.0 (last version with Unix support)
- Remove stale packages (NETStandard.Library, System.Collections)
- Set System.Drawing.EnableUnixSupport via runtimeconfig + AppContext
- Pin System.Resources.Extensions 8.0.0, suppress NU1603
- Copy game_folder assets to build output (no run.sh required)
- Sta.CurrentDirectory → AppContext.BaseDirectory for portable path resolution
- Enable UnsafeBinaryFormatterSerialization + InvariantGlobalization
- Add global.json pinning SDK to 8.x
- Remove ambiguous `using System.Net.Mime.MediaTypeNames` in ParT.cs
- Add `using System.Reflection` to Program.cs

SlaveMatrix/Properties/launchSettings.json

@@ -2,7 +2,10 @@
   "profiles": {
     "SlaveMatrix": {
       "commandName": "Project",
-      "workingDirectory": "$(SolutionDir)\\game_folder"
+      "workingDirectory": "../game_folder",
+      "environmentVariables": {
+        "DOTNET_SYSTEM_GLOBALIZATION_INVARIANT": "true"
+      }
     },
     "WSL": {
       "commandName": "WSL2",

SlaveMatrix/SlaveMatrix.csproj

@@ -4,7 +4,7 @@
     <AssemblyName>SlaveMatrix</AssemblyName>
     <GenerateAssemblyInfo>False</GenerateAssemblyInfo>
     <OutputType>WinExe</OutputType>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <PlatformTarget>x64</PlatformTarget>
   </PropertyGroup>
   <PropertyGroup>
@@ -14,10 +14,17 @@
   <PropertyGroup>
     <ApplicationIcon>app.ico</ApplicationIcon>
     <RootNamespace />
+    <InvariantGlobalization>true</InvariantGlobalization>
+    <EnableUnsafeBinaryFormatterSerialization>true</EnableUnsafeBinaryFormatterSerialization>
+    <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
+    <NoWarn>CA1416</NoWarn>
   </PropertyGroup>
   <ItemGroup>
     <ProjectReference Include="..\2DGAMELIB\2DGAMELIB.csproj" />
   </ItemGroup>
+  <ItemGroup>
+    <Content Include="..\game_folder\**\*" CopyToOutputDirectory="PreserveNewest" LinkBase="" />
+  </ItemGroup>
   <ItemGroup>
     <Compile Update="Properties\Resources.Designer.cs">
       <DesignTime>True</DesignTime>

SlaveMatrix/SlaveMatrix/GameClasses/Program.cs

@@ -1,15 +1,19 @@
 using System;
+using System.Reflection;
 using _2DGAMELIB;
 
 namespace SlaveMatrix
 {
     internal static class Program
     {
+        static Program()
+        {
+            AppContext.SetSwitch("System.Drawing.EnableUnixSupport", true);
+        }
 
     	[STAThread]
     	private static void Main(string[] A_0)
     	{
-
             Sta.LoadConfig();
 
             double percent = 35.0;

SlaveMatrix/SlaveMatrix/GameClasses/Sta.cs

@@ -1410,7 +1410,7 @@ namespace SlaveMatrix
     		上着B_クロス初期化 = default(上着B_クロス情報);
     		上着B_前掛け初期化 = default(上着B_前掛け情報);
     		ブーツ初期化 = default(ブーツ情報);
-    		CurrentDirectory = Directory.GetCurrentDirectory();
+    		CurrentDirectory = AppContext.BaseDirectory;
     		GameData = new GameState();
     		SavePath = Path.Combine(CurrentDirectory, "save");
     		ImiPath = Path.Combine(CurrentDirectory, "text", "Basement", "Training", "Imitation.txt");

SlaveMatrix/runtimeconfig.template.json

@@ -0,0 +1,5 @@
+{
+  "configProperties": {
+    "System.Drawing.EnableUnixSupport": true
+  }
+}