Upgrade to 88.2.90 (#131)

* Upgrade to v88.2.40-pre

WPF - Add https scheme to default URL to workaround upstream issue
https://bitbucket.org/chromiumembedded/cef/issues/3079/cant-load-urls-without-scheme

* Net Core - Add AnyCPU Platform to projects/solution

* Net Core - Add RuntimeIdentifier based on PlatformTarget

- Set RuntimeIdentifier based on PlatformTarget (PlatformTarget isn't set of AnyCPU)
- Set SelfContained to false so as not to provide a Framework Dependant build (don't include the whole .net framework)

* WPF/WinForms - Change CefSharpBuildAction to Content

For testing of ClickOnce publish

* Net 5.0 - Update to include PublishSingleFile settings

- .Net 5.0 Publish Settings for PublishSingleFile
  https://docs.microsoft.com/en-us/dotnet/core/deploying/single-file
  Defaults differ compared to .Net Core 3.1
- Set RollForward to Major so runs on newer runtime version
- Add net5.0-windows TargetFramework

* .Net 5.0 - Publish Single Exe Example

- Use the main application exe as the BrowserSubprocess when self publishing a .Net 5.0 exe
- Only the WPF and WinForms examples have been updated

https://github.com/cefsharp/CefSharp/issues/3407

* Upgrade to 88.2.90

CefSharp.MinimalExample.Wpf/MainWindow.xaml

@@ -41,7 +41,7 @@
         </Grid>
         <Border Grid.Row="1" BorderBrush="Gray" BorderThickness="0,1">
             <wpf:ChromiumWebBrowser x:Name="Browser"
-                                    Address="www.google.com">
+                                    Address="https://www.google.com">
                 <behaviors:Interaction.Behaviors>
                     <behaviours:HoverLinkBehaviour x:Name="HoverLinkBehaviour"/>
                 </behaviors:Interaction.Behaviors>