Xml Doc - Add more comments and fixes

Cef.Shutdown - Improve Thread Check error message

Nuget - Revert back to the 63 package props/targets files

The newer changes aren't complete - missing at least the BrowserSubprocess, so going with what's been tested for now.

Will fix in `master`

IFrame.LoadRequest - Update xml doc

LoadRequest can only be called when a render process has already been created, suggest loading a data uri initially

http://magpcss.org/ceforum/viewtopic.php?f=6&t=16058&p=38563&hilit=LoadRequest#p38559

Resolves cefsharp#2451

WPF - DisableTouchpadAndWheelScrollLatching

In ChromiumWebBrowser disable by default when default call to Cef.Initialize

Issue cefsharp#2408

Nuget - Revert back to the 63 package props/targets files

The newer changes aren't complete - missing at least the BrowserSubprocess, so going with what's been tested for now.

Will fix in `master`

build.ps1 - Set assemblyversion to same as version when appveyor tagg…

…ed build (release build)

Update MyGet API Key

Previous key expired

JSB - JavascriptObjectRepository.ResolveObject was only being called …

…when object previously registered

The HasBoundObjects check has been removed, now we always attempt to GetObjects and return a response

Resolves cefsharp#2273

CookieManager - Make unmanaged constructor internal