Use ConcurrentDictionary in deduplicate names

reenable delay signing and `sn -Vr` for build assemblies to speed up local work

* Merge branch 'combine-sparse-open-decls-and-hash-directives' into rider

# Conflicts:
#	src/fsharp/TypeChecker.fs

* add Structure tests

remove test dependency on sn.exe

only public sign assemblies, not test sign

normalize backslashes in .nuspec files

publish non .nupkg insertion items

This cleans up a bunch of build warnings saying that nothing could be found in the `lib\` directory.

Update feed tasks version

ensure the expected dotnet CLI is actually present

* fix FSharpMemberOrFunctionOrValue.IsConstructor property for ctor definition

* add a test

Contains various bug fixes

This reverts commit d8544fe2.

* add static members to the extended completion

* provide static method in completion for any type

* suggests types and modules only at pattern type position (x: ...)

* handle all places where type can be used

* fix

* union cases should not appear in completion at type hint position

* For FSI on coreclr use ResolutionEnvironment.CompilationAndEvaluation just like on desktop

* Trim fsi from buildtasks dll

* Put back converter code

* We don't support Itanium any longer

* Remove Itanium testcase

* Separate FSc and FSharpCommandLineBuilder, feedback

* Move from Converter To Func<int>

* Added 'notest' argument for build

* Quick rename

* Fixed and

* One last fix for and

* Fixing build scripts

* Simplifying no-test

Thanks for this.

Merge dev15.6 to master

only pull references from NuGet packages, never from the GAC

Added tests to CompletionProvider tests. Cleaned up formatting for CompletionProvider tests.

* name resolution environment captures last ident range in long ident instead of full range

* fixed: wrong symbols for namespaces

* notify name resolution sink about all intermediate namespaces in open declarations

* Revert "name resolution environment captures last ident range in long ident instead of full range"

This reverts commit 65f866a80625725fb490a90b91a539078b96373c.

* fix ranges

* we need all modules

* return namespace uses in the order they appear in source code

* fix a test

* fix a test

* notify name resolution sink with each root namespace fragments

* fix `open global.xxx` compilation

Merge master to dev15.6