Add a new suggested action "FixMultipleSuggestedAction" for IDE layer corresponding to FixMultipleCodeAction and FixMultipleContext. Also implement the FixMultipleOccurrencesService to compute and apply a FixMultipleSuggestedAction.

Subsequent change will use this service to fix (suppress) diagnostics selected in the error list.

1) Add a FixMultipleCodeAction for fixing specified set of diagnostics in a FixMultipleContext.
2) Add a IFixMultipleOccurrencesService which takes a specific set of diagnostics and computes and applies a FixMultipleCodeAction. This will eventually be used to bulk fix or suppress instances of diagnostics from the error list.

Also handle this new context and fix scope in the suppression fixers, so that the disconnected baselining scenario can use this functionality.

Add a subtype of FixAllContext: FixMultipleContext, which will be used for fixing a specific set of diagnostics.

Fixes #4697

CSharpSyntaxFactsService.GetExpressionOfMemberAccessExpression will return null if the node is not a MemberAccessExpressionSyntax, in VB we throw. This changes VisualBasicSyntaxFactsService.GetExpressionOfMemberAccessExpression to also return null.

We now get these through project.json.

Improve quality of Watson crash dumps when MetadataDecoder.LookupTopLevelTypeDefSymbol throws in context of an Async execution.

Related to DevDiv 132385.

Since this is a packaging projec, it doesn't need to get references
to flow anywhere.

These are added through project.json, we don't need these.

The portable tooling expects this package is added to portable projects,
but it wasn't in these.

...as if they were locals.

Fixes #5069

Fixes #4689

Fixes #4615.

Fixes #4544.

There was an assumption that properties cannot share initializer, but this can happen when multiple WithEvents fields are sharing [As New …] initializer. Binder.BindPropertyInitializer is adjusted to handle the case.