Drop .NET Core 3.1 (#307)

- [X] Updates Zlib Bindings
- [X] Updates Argon2 Bindings
- [X] Drops .NET Core 3.1 support
- [X] Updates CI/CD

Bumps release version
Updates documentation

.github/workflows/build-test.yml

@@ -22,12 +22,12 @@ jobs:
     - name: Setup .NET 5
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 5.0.100-rc.2.20479.15
+        dotnet-version: 5.0.100
     - name: Restore NuGet Packages
       run: dotnet restore --force-evaluate
     - name: Build Server
-      run: dotnet build -c Release -f net5.0 --no-restore Projects/Server/Server.csproj
+      run: dotnet build -c Release --no-restore Projects/Server/Server.csproj
     - name: Build UO Content
-      run: dotnet build -c Release -f net5.0 --no-restore Projects/UOContent/UOContent.csproj
+      run: dotnet build -c Release --no-restore Projects/UOContent/UOContent.csproj
     - name: Test
-      run: dotnet test --no-restore -f net5.0
+      run: dotnet test --no-restore

.github/workflows/create-release.yml

@@ -17,7 +17,7 @@ jobs:
     - name: Setup .NET 5
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 5.0.100-rc.2.20479.15
+        dotnet-version: 5.0.100
     - uses: dotnet/nbgv@master
       id: nbgv
     - name: Create Release
@@ -53,7 +53,7 @@ jobs:
     - name: Setup .NET 5
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 5.0.100-rc.2.20479.15
+        dotnet-version: 5.0.100-
     - uses: dotnet/nbgv@master
       id: nbgv
     - name: Load Release URL File from release job