Fix crash in generate constructor when type declaration is improperly formed
Fixes #6918

Do not copy vsix manifest files to the common build folder
Fixes #6424

Skip test for bug #6866

Audit usages of Compilation.References

Mitigate OutOfMemory when clearing large output buffers

Most callers are probably interested in
`Compilation.ScriptCompilationInfo.PreviousScriptCompilation` as well.
Behavioral changes expected in QuickInfo (fix crash) and SymbolFinder
(offer additional CodeFixes).

Fixes #6616 and #6657.

Protect against accidental merges to master

We remove all spans from the projection buffer *before* updating the
subject buffers so that composite/merged changes to the projection buffer
don't have to be computed.  This seems to alleviate the problem we were
having with OOMs when clearing large output buffers (which did not,
themselves, trigger OOMs).

We conjecture that this will also eliminate the race described in #6600
because the output buffer deletion should no longer affect the projection
buffer.  However, if the race was between input and clearing, then it may
still be an issue (though it's not clear how, since both edit the buffer
on the UI thread).

fixed error list refresh issues

Disable concurrency throttling on Windows

Not required currently

Enforce the precedence of a query expression

Support -trait and -notrait for RunTest.exe

Corrects the ConvertToAutoPropertyCS sample

Removing WpfFact from Analyzer and Codefix tests

Add a portable v5.0 CodeAnalysis build task

Making add static more deterministic
fixes #5359

Add an MSBuild log to output on Windows

Fix issues with VSIX deployment and assembly binding in master for RTM machines

Moves the build task code to a shared project that we use to build
at net45 and a portable50 CodeAnalysis MSBuild task. Also upgrades to
nuget v3.2.1-rc since this is necessary to understand the dotnet4.3 spec
used in the project.json.

This helps with build failure diagnostics. I've verified that this
added nearly-zero impact on build time.

Exit on assert failure in bootstrap build

It's always supposed to be true at this point, and only half the things
were looking at it in the first place.

...to Roslyn.VisualStudio.Setup.vsix