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Fixes:#17140

Dynamic member access and indexers are not safe to return by reference.

Support `foreach` statements that use different type from enumerable

Check the type of conversion being used in the foreach statement before deciding if we should offer to convert it to var.

support creating remote session that doesn't require solution 

Fix dynamic analysis instrumentation for VB

* use io exception message

* disable Culture test

* run tests on english ui culture

* use hresult detection code that works cross-language

* fix indentation

* Only run FileShareDeleteCompatibility_Xplat on an english machine

* Brace on new line

move down diagnostic analyzer executor down to workspace layer since …

We insert a bound node of method call to `CreatePayload(Guid,int,int,ref bool[],int)` during instrumentation for each method,
however, the node of the 4th argument (of type bool[]), which is an array access (something like payloads[2],
where payload is of type bool[][]), is created as an RValue. As an result, in the IL generated for instrumentation,
the argument is the reference to an local variable instead of to the indexed element in the array. This will cause `CreatePayload`
to throw an exception when it tries to add a payload array for a method that already has a payload array created.

Tree perf all work

Run our Nuget package index in the OOP process.

Report error when receiver of a query expression is a namespace

Disable definition-grouping when doing a FindImplementations/GoToDef call.

Don't cache package information for non-C#/VB languages.

Fix crash when trying to remove a cast when comparing to an enum.

Merge master into post-dev15

Fix NullReferenceException in BoundCall.DeriveArgument.

# Conflicts:
#	src/Tools/Source/SyntaxVisualizer/SyntaxVisualizerExtension/project.json

	Rename some types/features to better distinguish them from new feature work.

	Rename some types/features to better distinguish them from new feature work.

Rename some types/features to better distinguish them from new feature work.