Add parsing of NuGet.Config files to RepoUtil and other work.

Use nuget restore to determine the exact dependencies we need to insert into VS.

Handle pointer and error types in NormalizeTaskTypes

Fix #12755

Rewrite make async

Fixes #12578

It looks like a couple of changes brought them out of sync
and VS really dislikes it.

The RepoUtil tool will now include NuGet feed information in the output
for the 'consumes' command.
Added a mechanism for excluding project.json files from being included.
Package conflicts will no longer result in an unhandled exception, instead
it will output a list of the conflicts.

Add IVT to Orchestrator UnitTests

Fix our MSBuild logic around signing

Make EncodedStringText fallback encoding lazy

get callstack on codefix crash

Follow-up on some recent changes in C# compiler.

For new switch semantics, we rely on subsumption checking to

Make fuzzy add-using matches clearer

Fixes #12985

Preserve trivia when converting a property to a method.

Fixes #12143

Remove unused ref return error codes

Binaries in Roslyn have only three possible signing states:

1. Public signed with Microsoft controlled keys (shipping binaries)
2. Real signed with a full key in the Roslyn repo (non-shipping binaries)
3. Not signed

Our build targets still had a lot of dead logic around our old methods which included delay signed binaries.  This cleans all of that up and removes some dead variables.

Merge dev15-preview-4 into master

Merge microupdate into master

Merge remote-tracking branch 'upstream/microupdate' into merge-microupdate-into-master20160810-173810

Merge remote-tracking branch 'upstream/dev15-preview-4' into merge-dev15-preview-4-into-master20160810-150125

The original intent of #12056 was to improve parsing recovery in the
cast of a leading accessibility modifier on a local function. However, I
mistakenly allowed for recovery for an accessibility modifier *anywhere*
in the modifier list of the local function.

This is a mistake because it significantly complicates parsing back-out.
While it's easy to recognize that the local function parsing failed and
skip any leading accessibility modifiers, it's significantly more
complicated to find and skip all accessibility modifiers anywhere in a
sequence of modifiers.

This PR changes the parsing backout to only consider accessibility
modifiers at the start of statements. Any other case will be treated
like other bad modifiers in local functions -- they will be marked as
errors in the declaration list. Fixes #12947.

Make the binder resilient to ref type and ref expression nodes.

Misc. changes for Task-like type support

add vs project guid in compilation input telemetry

Adjust scope of locals declared within Expression Statements according to the latest design.

Add Codelens service for VS

Split syntax generation into three files

Update the Roslyn build version to 1.3.4