Dynamic Analysis Metadata spec

Provide an async codepath for sqlite writes.

This changes BuildBoss to flag the case where the Project element in a
ProjectReference doesn't match the actual GUID of the Project being
referenced.

Remove unnecessary delegate allocations in the analyzer driver

Remove unused private method

Fix project system GUIDs for VB projects in Roslyn.sln

Removing zero initialization of locals upon entering a scope. (for locals captured by a local function).

Update Elfie version to be 0.10.6

The newest version of VS brought down a change in MSBuild that broke
on our use of SelfContained.  Chatted with the SDK team and I understand
what the real fix is.  Going to take some time to implement though.
Until then disabling this property on local developer builds.

The Net20 framework projects were accidentally depending on 3.5
framework in order to build.  This is due to how they generate
resources.

By default when generating resources for a 2.0 framework project the
MSBuild task from 3.5 was being used.  This is not installed by default
with Visual Studio and only through the 3.5 framework.

This went unnoticed when moving to the new SDK because all of the
Jenkins machines and @jaredpar machines have it installed.

Setting the `$(GenerateResourceMSBuildRuntime)` property to
CurrentRuntime will use the GenerateResource task from the current
version of MSBuild.  This is how resources were being generated before
the migration.

This was reverted as a part of 5fe4adb3 but should have been
put back.

Fixes #18691

Don't call into sqlite on platforms where we havne't provided support for it yet.

Merge dev15.3-preview1 to master

Update .gitignore for Rider

Merge remote-tracking branch 'upstream/dev15.3-preview1' into merges/dev15.3-preview1-to-master-20170501-070007

Fixes #19141