Ported fix for #5530 to VB

Initial work to clean up lifetime of keyed Code Model elements

Clean up host object public APIs

Don't draw line separators if they would intersect with a collapsed outlining region.

Fixes #5007

Handle known-matches collisions

Temporarily add System.Runtime facade reference explicitly, since the host object moved to portable lib

Centralize NuGet Restore

Remove deprecated feed

Calculate exception regions when an active statement is deleted

Updating netci.groovy to no longer throttle mac/linux jobs where the …

The corefx feed is deprecated.  Removing it.

Disabling the lock file check until we can get this sorted out.

Add ArrayCreationExpression to SyntaxGenerator

Disable constraints checks while binding a using target.

* Removing some dead code
* Clarifying comments
* Giving consistent names

Allow 'await' at start of statement in Script

Fixes #4419

Add DeleteLine and CutLine operations to interactive window

Fix for #3119 -- "Then" is prettylisted into ElseIf statements now, plus unit tests added on this for If and ElseIf.

Centralizing the nuget restore steps to the cibuild.cmd file. We are starting to see some intermitent restore differences between machines.  Trying to normalize our process as much as possible.  With this change all restores take place in the same context using the same syntax.

Fix bool parameter marshalling in Microsoft.DiaSymReader interfaces

Don't explicitly focus the editor when our ICompletionSession is dismissed

Spelling fixes, mostly in VB compiler

Fix suppression fixer to handle pragma suppressions for diagnostics with multiline span.

Fixes #2764

Years ago, we added a line of code to explicitly focus the editor when our ICompletionSession is dismissed, to handle a specific problem with VB completion. Essentially, through a subtle confluence of focus issues and events firing, VB line commit would run when double-clicking an item in the completion list to commit it. However, this line is causing numerous other problems in Visual Studio. (There's a particularly bad one when clicking VS toolbar item when the completion list is up.) After removing this line, I can no longer reproduce the original problem. So, I'm removing this to address the other problems. If it turns out that the original problem still occurs in certain circumstances, we'll work with the VS editor team to add a proper fix.

Removed unused reference