Merging on behalf of @alrz. Thanks for the contribution.

Revert "move StreamJsonRpc to latest version"

Fix caching logic

Update our binary numbering for the new year

We've previously stamped binaries with numbers like ymmdd, but for 2017
that would mean our number would be 70101 which is too big for some
PE file headers. We'll update to continue incrementing the month field
instead.

Fixes dotnet/roslyn#12038.

The caching logic is now much stricture about the handling of missing
references during caching.  There are valid cases for missing
references, light up features.  But there are other cases where it
simply repreesnts an error.  The code now defaults to assuming missing
references are an error and opts in the cases where it's known to be
okay.

Ignore missing directory in ShadowCopyAnalyzerAssemblyLoader.DeleteLeftoverDirectories

Disable feature when it would cause an error with expression trees.

Fixes #16028

Cleaning up our *.*proj, *.targets, and *.props files.

Fix scripting test

Update SRM, SCI to builds with profiling data

Add Razor shims to NuGet

Ensure that all *.*proj, *.props, and *.targets files are prefixed with the xml and copyright elements

Fixes #15910
Also fixes a sequence point issue with the let expression. Specifically, the source range for the query lambda included more than the expression of the let, but included the entire query clause. It now includes only the expression, like other query clauses.

Fix our use of suppressParent in project.json