Update nuspecs for netstandard1.3 change

Be resilient to not being able to get a SymbolTreeInfo for a given PEReference

Implements support for type characters in tuple types in VB.

Support round-tripping of anonymous functoins and anonymous delegates.

Previously, when parsing a local function we held off on creating the
node until we actually saw a body because the local function could be
ambiguous with an await statement until then. However, we never verified
that the parsed return type was "await", meaning we were overly
conservative in classifying incomplete local functions. This created a
very bad typing experience where completion could not tell that you were
declaring a local function until the body, which created many incorrect
results in the completion list, including in the generic parameter list.

This change verifies that the return type we've parsed is actually the
literal text "await" before considering the parse ambiguous.

Fixes #13480.

Cache what symbols a serialized defintion rehydrated to.  

Cache what symbols a serialized defintion rehydrated to.  That way we don't have to recompute it every time we hear about a new reference.

FindReferences: Do not cascade to anonymous *delegate* parameters.

Update SymbolKey to use the new CreateAnonymousType api.

wait for finalizers to release all garbage at the end of the build

Remove hashcodes from symbol keys.

Fix redirects and dependencies of two projects

Revert "Delete unused SQM interfaces (#14299)"

If no IDocumentDifferenceService is exported, consider the whole document changed

This reverts commit 7259d90b. These
are still being pulled in by the ruleset editor.

* don't reduce integer literal tokens that have digit seperators

* Fix typo

* extract digit seperator