Microsoft.DiaSymReader.Native package fixes

Syntactically classify buffers without a workspace

csi: Update ScriptOptions with the latest values of current dir, search paths

When a project or document is removed/closed, clear out all the squiggles we currently have for them.

Inherit references from previous submissions

Don't generate a binding redirect for Microsoft.Build.Tasks.CodeAnalysis

Hopefully, this will fix internal bug 157535.

Fixes #873

Sometimes there are buffers with our C#/VB content types that are not added to the Running Document Table and therefore never end up in the MiscellaneousFilesWorkspace (or any workspace), such as the Source Control "Annotate" view. This change updates the Syntactic Classifier to handle such cases by parsing its initial snapshot for tagging (changes are not observed, but the known use cases of this fix are uneditable anyway).  There are some exceptions to this behavior (e.g. the Immediate window) which require us to go digging through attached views, but we default to classifying these buffers now.

Checking whether the node we are given is null
Fixes #6477

Open documents with FileShare.ReadWrite | FileShare.Delete

A long time ago, we did this to ensure that when we're asynchronously
reading files we don't lock the file and break other tools trying to
write. We would check the last modified timestamp to know if we
"definitely lost" the race and would try to bail. This behavior was
accidentally lost in 97862d24, and the comment saying why we did that
later lost in cdca0653. This restores opening files with ReadWrite |
Delete, and changes what we do if we detect the race. Previously we'd
return the contents of the file, but nothing would then retry the read
later since at the time we had no mechanism. Since then we now treat
IOException as an indication that we need to retry, so we now just
throw IOException when we know something went wrong.

Implement DocComment property for external code model elements

Save the IVsInteractiveWindow when it is created

Overridden member for a member of constructed generic type should be calculated based on overridden member for its definition.

Avoid depdendency on pre-release System.Console

[AskMode] Fix `GetOverlap` method of `SortedSpans`

Use script file path along with #r directive string in the directive reference map

Overridden member for a member of constructed generic type should be calculated based on overridden member for its definition.

Fixes #6148.

Fix Crash from Analyzers node context menu invocation #6006

Adds support for event add-handler accessors.

Right click "Suppress" should be enabled even when the error list selection has some suppressed issues