* Struct Records and Unions have ValueType super type

* Add qa tests for ValueType constraint on struct Records and Unions

This fixes the very long-standing issue where trying to add a new file to an F# Web project
opens a window with no file templates available.

See for example here for the workaround that was required for VS up to 2015:
http://bloggemdano.blogspot.fr/2013/11/adding-new-items-to-pure-f-aspnet.html

There's several reasons for this, the most important being that only .NetFramework projects will provide a useful download. Also, not doing this resulted in a bug for Xamarin projects (Issue 2992). This fix is identical to what other projects do in Visual Studio.

* Simplify ci to 3 parts now that we don't build many fsharp.core.dlls

* ci_part1 was still to broad

* remove portables

* temp

* remove bin from profiles paths

* reorder setup build

* Ensure nuget is built prior to setup

* remove portable customizations from targets

* fix ci_part1

* Tweak FSharp.Core.4.1.xxx nuspec definition for portable 259

* Correct profile259 path

* Add IL output option for deterministic output

Thread a new option through the options to the code writing the IL.
For the moment just use a constant for deterministic timestamp, and use 0 as the timestamp in the MVID

* Basic check to prevent wildcard version + deterministic at the same time

* Hash the code, data and metadata, and use for mvid + timestamp

* Fix fsc & fsci help tests by adding in new command line option for deterministic

* tests for command line, wildcard versions, normal non-deterministic behaviour

* Attempt to get CI to support timeout

* Allow PRECMD to call FSI more than once, and use this for copying files and pausing to prevent race-condition

* PortablePdbBuilder use consistent id 

If compiling deterministically, use deterministic id provider support in 
making a pdb builder. see https://github.com/dotnet/roslyn/blob/master/src/Compilers/Core/Portable/PEWriter/PeWriter.cs#L132

* Portable and Embedded pdb now deterministic

* wip: fix up timestamp in pdb, but mvids still out of sequence

* Fix breaking change from rebasing on master

* Add notes about determinism with non portable pdbs
Make the checks for finding embedded guids more
strict and unique

* Throw error if determinsitc build and non-portable pdb specified

* Better error message for pattern matching

* Better error message for pattern matching guards

* fix test

* Test pattern match guards

* s/return type/have type

* cleanup

* Fixes #3170

* Adding a test

* Rename targets --part1

* Rename targets --part1

* Microsoft.FSharp.Targets has a T as does Microsoft.Portable.FSharp.Targets

* dotnet SDK uses the msbuild TargetFramework property, so we need to change our build a bit.  Renaming it to TargetDotnetProfile in our files

* Overeager renaming

* Don't forget the mono stuff

Remove weird recursive function

Better error message when we forgot . in dictionary access

* Better error message for list/array init

* add comma