Remove legacy swiftshader

[amaitland]

https://bitbucket.org/chromiumembedded/cef/issues/3176/win-linux-ship-vk_swiftshaderdll-vulkan#comment-62354067

Swiftshader has been removed from chromium (SwANGLE has been the default for some time now). M101 will be the last version to ship with swiftshader

• Update Nuget packages
• Update wiki

[amaitland]

References within the source have been removed, and cef-binary packages have been updated.

Will update wiki after the first stable M102 release.

[amaitland]

Wiki has been updated https://github.com/cefsharp/CefSharp/wiki/Output-files-description-table-(Redistribution)/_compare/308ac3fceca1ab4a8e92e26a9aae3442d91bd0d0...f7d9dffd251d4b5d961150cc83692d1e1ff91873