Import CefSharp.Wpf.HwndHost into main repository.

[amaitland]

Fixes: [issue-number]
#4982

Summary:

• Import the CefSharp.Wpf.HwndHost code into a subfolder in the CefSharp.Wpf project

Changes:

• Import code into HwndHost folder (namespace in CefSharp.Wpf project)
• Add new common interface
• Add the existing example (though will be migrated to MinimalExample shortly)

How Has This Been Tested?

• Added basic unit tests

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Updated documentation

Checklist:

• Tested the code(if applicable)
• Commented my code
• Changed the documentation(if applicable)
• New files have a license disclaimer
• The formatting is consistent with the project (project supports .editorconfig)

[amaitland]

Still a few thing to resolve

• Meta nuget package
• Add some tests now the project is in the main repo
• Update the example to be part of the Wpf example so it can used the existing tabbed interface
• Remove the current Example.

[AppVeyorBot]

❌ Build CefSharp 130.1.90-CI5096 failed (commit ae53ed4b50 by @amaitland)

[amaitland]

I was hoping to have this done for M131, feels a bit too rushed, so will wait for M132

[amaitland]

Need to manually cherry pick changes from PR cefsharp/CefSharp.Wpf.HwndHost#31

[AppVeyorBot]

❌ Build CefSharp 131.2.70-CI5106 failed (commit dd051548c7 by @amaitland)

[AppVeyorBot]

✅ Build CefSharp 131.2.70-CI5116 completed (commit f97afa386e by @amaitland)

[campersau]

Can this be removed in favor of

CefSharp/CefSharp.Wpf/DelegateCommand.cs

Line 14 in a81202b

internal class DelegateCommand : ICommand

?

[amaitland]

Excellent suggestion! Thanks.

[AppVeyorBot]

✅ Build CefSharp 131.2.70-CI5118 completed (commit 02f8d697b6 by @amaitland)

[AppVeyorBot]

✅ Build CefSharp 131.3.10-CI5122 completed (commit 440a946ebe by @amaitland)

[AppVeyorBot]

❌ Build CefSharp 131.3.10-CI5124 failed (commit d8816e3d63 by @amaitland)