buildhelp.bat - Add Platform AnyCPU

Sandcastle wasn't building without a Platform (even though the CefSharp.shfbproj defaults to AnyCPU if Platform is empty)

Core - RequestContext::Create add missing UnWrap call

Unsure if this method is still used, probably isn't. Add the missing call incase it's used at some point

Core - Make LegacyJavascriptBindingEnabled obsolete

Will likely be removed in the future as it's been replaced.
Setting after creating your ChromiumWebBrowser instance also doesn't work

Issue cefsharp#2977

Test - Add CanLoadRequestWithPostData test

WPF - Resize Hack for when browser switches from hidden to visible (c…

…efsharp#2779)

- Add 1 to the width/height rather than subtracts like the hack in the previous
versions
- Delay between resizes is now configurable via ResizeHackForIssue2279DelayInMs

Net Core - Regenerate CefSharp.Core.RefAssembly

TODO: It's not automatically regenerating at times, need to fix this

Upgrade build version to 86.0.240

Upgrade to 85.3.13+gcd6cbe0+chromium-85.0.4183.121 / Chromium 85.0.41…

…83.121

- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15999
- https://bitbucket.org/chromiumembedded/cef/commits/cd6cbe008b127990036945fb75e7c2c1594ab10d

Xml Doc - Fix param reference

Upgrade build version to 85.3.121