Fixed crash accessing js objects dictionary concurrently

Add a ".NETCoreApp3.0" dependency to the .nuspec files. (#2894) This ensures the transitive dependencies (CefSharp.Common) are correctly resolved in .NET Core 3.0 projects. Contributes to #2796

ICookieManager - Update xml doc Updated to reflect upstream changes see https://magpcss.org/ceforum/apidocs3/projects/(default)/CefCookieManager.html Resolves #2855

WcfEnabledSubProcess - OnBrowserDestroyed add null checks and log msg if WCF was null It's likely the WCF host didn't start and some break points should be added in ManagedCefBrowserAdapter::InitializeBrowserProcessServiceHost to catch the actual exception. We're not logging as it causes too many false positives as it's expected there will be errors when browser is created then rapidly Disposed. Resolves #2839

UrlRequestFlags - Update with new values https://bitbucket.org/chromiumembedded/cef/commits/cd5995a440302e0ef5a97a000faa922149ffb177?at=3683#Linclude/internal/cef_types.hT1281

Revert "build.ps1 - Upgrade to support new version scheme" This reverts commit 1f39e4259587855b49b2e6f2931044455d647413.

Upgrade to CEF 3.3578.1870.gc974488 / Chromium 71.0.3578.98

WindowInfo.h - Make unmanaged constructor internal

RequestContext - Improve CEF UI thread xml doc

Cef.h - Remove ThrowIfCefNotInitialized As IsInitialized is set when CefInitialize returns and it appears to be possible the OnContextInitialized is called before it returns then this exception wasn't going to work. Testing with Cef.GetGlobalRequestContext and Cef.GetGlobalCookieManager and they both return null if called before Cef.Initialize So it shouldn't be possible to actually access the cookie manager/RequestContext. Improved the xml doc Resolves #2600

Fix some xml doc encoding issues

Upgrade to CEF 3.3497.1841.g7f37a0a / Chromium 69.0.3497.100

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 #2451

WPF - DisableTouchpadAndWheelScrollLatching In ChromiumWebBrowser disable by default when default call to Cef.Initialize Issue #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 tagged build (release build)

Update MyGet API Key Previous key expired