Merge pull request fsharp#926 from baronfel/project-options-fixes

Additional rebased commits on top of the january merge

Fsharp integration january 2020 (fsharp#919)

Contains commits from 32b1249 to 5a01170 from dotnet/fsharp.

Notable features:

* lowered allocations for large strings and char arrays (notable source file texts)
* improved support for byreflike rules with regards to type abbreviations
* better support for scopes in recursive modules
* better location of .net core reference assemblies
* lowered allocations for several internal compiler structures
* better error messages for anonymous record mismatches
* FSharpChecker learned how to keep background symbol uses
* Project cracker/project cracker tool were removed
* Better support for consuming C# inref parameters
* preview-level functionality for #r "nuget" in scripts

just build only for travis right now

Build Branch: release/dev16.4

Internal ID: fsharp-ci/20191106.5
Internal VS ID: rel.d16.4-29519.181

add release notes for version 33.0.0

September integration done (fsharp#913)

September merge

* integrate dotnet/fsharp from e1b8537 to 48f932c
* notable changes include:
  * (preview) nameof
  * (preview) open static classes
  * Fixed 64-bit integer literal parsing
  * Better exhaustiveness checking for byte and sbyte pattern matches
  * Better native resource handling
  * Script-host assembly load events

Build Branch: release/dev16.3

Internal ID: FSharp-Signed/20190905.1
Internal VS ID: rel.d16.3-29318.209

Integrate fsharp aug 11 2019 (fsharp#908)

Integrate fsharp aug 11 2019

Build Branch: release/dev16.2

Internal ID: FSharp-Signed/20190621.1
Internal VS ID: rel.d16.2-29123.88

update releas notes