* initial support for span, readonly refs, byref-like structs

* fix proto build

* make proto work with previous FSharp.Core

* make proto work with previous FSharp.Core

* update baselines

* integrate code cleanup

* integrate code cleanup

* integrate code cleanup

* integrate code cleanup

* fix build

* fix build

* implicit deref of byref returns

* add tests for Memory, ReadOnlySpan and ReadOnlyMemory

* fix tests

* simplify diff

* simplify diff

* remove duplicate error messages

* fix build

* test updates

* fix build

* fix build

* update baselines

* fix uses of NativePtr.toByRef

* switch to inference using byref pointer capabilities

* fix proto build

* update baselines, byref extension methods

* fix test errors

* emit in,out,modreq attributes correctly

* update tests

* fix build

* fix build

* fix tests

* fix tests

* get it right silly boy

* fix test

* minor cleanup

* add more tests

* clarify overloading behaviour + test case

* fix build break

* fix build of tests

* update tests

* add more tests

* byref fixes

* updates for subsumption calls, error message, assign-to-return-byref

* test updates, implicit deref on byref return for normal functions

* update baseline

* improve debug formatting, better error message on implicit deref, improve error messages

* add more tests for recursive functions

* update baselines

* fix baselines

* updates for new test cases

* updates for new test cases

* test updates and byref-to-byreflike

* deal with 'M() <- expr'

* restrict addresses of immutable top-level things

* fix IsByRefLike on struct

* update tests

* fix test

* fix test

* improve check for no-return-of-struct-field-addresses

* fix test case

* First cut

* fix

* Order in the court

* Rename

* get rid of unused gtdservice

* wut

* Add file

* Remove unused opens

* do it right (marolf)

* Cleanup

* unused value

* Make the navigable URL the decl symbol

* refactor

* IT WAS A DIFFERENT MEF

* clean up a bit

@vasily-kirichenko 

Thank you for this fix.

* Add assembly reader shim

* Add test

* Extract IModuleReader interface

* Update naming per PR review

* Add support for remapping Inbox TP

* Enable redirection of inbox type providr

* Feedback

* More feedback

* TrailingBackslash

sign additional insertion packages

* Fix TypeProviders with managed resources

* Revert "Fix TypeProviders with managed resources"

This reverts commit 6f925b323bbe2cf2e1a24d887cb47234389c9ef5.

* Fix Type Providers still don't compile in 15.7.2 #4972

allow `FSharpTargetsPath` to be properly overwritten in a project file

split swix packages into *.Compiler and *.IDE

* filter out duplicates in GetOpenDeclarations

* Add rec module to unused opens test

* add unused opens tests for rec modules

* fix unused opens for rec modules

* filter out symbol uses that lays above the open statement

* filter out union cases definitions

* fix ItemsAreEffectivelyEqualHash for Item.ModuleOrNamespaces

* use Dictionary to lookup symbol uses by declaring entity

* formatting

* cleanup

* use Dictionary to filter out already processed modules

* add BagAdd and BagExistsValueForKey Dictionary extensions

* fix signature help for ctors of aliases and provided types in `new T()` expressions

* less allocations

* refactoring and commenting

* return SemanticClassificationType.ValueType for types with measure

* color measured structs as structs (only)

* add tests (wip)

* all the tests are green

* simplify code

* Update service.fs

These two packages will no longer be dependent upon each other.

* use .NET SDK 2.1.201

* try to fix linux builds of fcs

* try to fix linux builds of fcs