Update wkhtmltopdf libraries to 0.12.5 and fix a callback was made on a garbage collected delegate bug

.editorconfig

@@ -0,0 +1,6 @@
+[*]
+end_of_line = crlf
+
+[*.cs]
+indent_style = space
+indent_size = 4

.gitignore

@@ -1,3 +1,5 @@
+.vs/
+.vs/config
 src/DinkToPdf/bin/
 src/DinkToPdf/obj/
 src/DinkToPfd.ConsoleApp/obj/
@@ -12,6 +14,7 @@ DinkToPdf.TestWebServer/bin/
 DinkToPdf.TestWebServer/obj/
 DinkToPfd.TestConsoleApp/Files/636281092862553384.pdf
 DinkToPfd.TestConsoleApp/bin/Debug/
+DinkToPfd.TestConsoleApp/bin/Release/
 DinkToPfd.TestConsoleApp/libwkhtmltox.so
 DinkToPfd.TestConsoleApp/obj/
 DinkToPdf.TestWebServer/libwkhtmltox.so
@@ -22,3 +25,4 @@ DinkToPdf.TestThreadSafe/Files/
 DinkToPdf.TestThreadSafe/Properties/
 DinkToPdf.TestThreadSafe/libwkhtmltox.so
 DinkToPfd.TestConsoleApp/Files/
+*.user

.vs/config/applicationhost.config

@@ -160,6 +160,14 @@
                     <binding protocol="http" bindingInformation=":8080:localhost" />
                 </bindings>
             </site>
+            <site name="DinkToPdf.TestWebServer" id="2">
+                <application path="/" applicationPool="Clr4IntegratedAppPool">
+                    <virtualDirectory path="/" physicalPath="C:\Users\chris.bryden\Source\Repos\rndusr0\DinkToPdf\DinkToPdf.TestWebServer" />
+                </application>
+                <bindings>
+                    <binding protocol="http" bindingInformation="*:50554:localhost" />
+                </bindings>
+            </site>
             <siteDefaults>
                 <logFile logFormat="W3C" directory="%IIS_USER_HOME%\Logs" />
                 <traceFailedRequestsLogging directory="%IIS_USER_HOME%\TraceLogFiles" enabled="true" maxLogFileSizeKB="1024" />

DinkToPdf.TestThreadSafe/DinkToPdf.TestThreadSafe.csproj

@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <AssemblyName>DinkToPdf.TestThreadSafe</AssemblyName>
+    <OutputType>Exe</OutputType>
+    <PackageId>DinkToPdf.TestThreadSafe</PackageId>
+    <GenerateAssemblyConfigurationAttribute>false</GenerateAssemblyConfigurationAttribute>
+    <GenerateAssemblyCompanyAttribute>false</GenerateAssemblyCompanyAttribute>
+    <GenerateAssemblyProductAttribute>false</GenerateAssemblyProductAttribute>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\src\DinkToPdf\DinkToPdf.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="System.IO.FileSystem" Version="4.3.0" />
+  </ItemGroup>
+
+</Project>