1. Do not flag parameters whose name has not yet been written (empty string). Fixes #36817
2. Do not flag parameters of partial method definition part. Fixes #36816

This reverts commit 0d8d2afb.

If you mouse over a local, field, etc., and we have computed nullable
flow analysis for it, we'll tell you whether the compiler thinks the
item is null or not at that point.

Fix couple of unit tests that started failing after #36566 merged from master to release\dev16.3-preview1

Not sure why the unit test failures were not caught by the merge PR, as these tests are failing consistently in CI for PRs targeting release\dev16.3-preview1

This implements IExperimentationService in the remote workspace; any
request for feature flags is forwarded to the main Visual Studio process
and the feature flag is queried there.
Co-authored-by: NJoey Robichaud <jorobich@microsoft.com>
Co-authored-by: NHeeJae Chang <hechang@microsoft.com>

Fixes #33464

Workaround for #32100 for Dev16.2

Fixes #34830

Fixes #36715

This slipped through because we didn't have any tests at all for
the case where we are using the type-inferrer to infer the case like:

    a = new A { B = { } }

where the inner one doesn't have a new B before it. The scenario wasn't
new but just happened to be the precise case that was broken.

Fixes https://github.com/dotnet/roslyn/issues/36702

Fixes #30324

Not sure why these are lowercase but makes the tests harder to read.

1. Make IDE0069 (DisposableFieldsShouldBeDisposed) conservative by bailing out on disposable types that don't have the Dispose implementation, but rely on base type implementing it and having virtual helper methods for dispose functionality

2. Make IDE0067 (DisposeObjectsBeforeLosingScope) conservative by bailing out on disposable objects that are passed as arguments to methods in metadata.

Requires updating to a new FlowAnalysisUtilities version.
Fixes #36498

Closes https://github.com/dotnet/roslyn/issues/30316

Also add extension methods to help with nullability

Closes #33807

* Fix for typing semicolon inside comments in an argument list

* Change to previously existing method

* Fix

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