Merge microupdate into dev15-preview-4

Add support for switching on float, double, and decimal.

# Conflicts:
#	src/Workspaces/Core/Portable/SymbolId/SymbolId.cs

Sign Roslyn.VisualStudio.Test.Utilities.dll

This DLL is used by testers and having it unsigned requires some expensive work arounds for them.

Also: restore alphabetical order of other DLLs in this list.

Risk: Very low.

Several of our EE binaries needed to be signed with different certificates than the standard Microsoft one.  Functionality was added to specify the certificate for the binary in question and all remaining references to the AuthenticodeCertificateName property were removed.

Port insertion fixes into dev15-preview-4

Adding back 'Microsoft.VisualStudio.Shell.Interop.SVsLog` interop type.

This adds back `src/Compilers/Core/Portable/Interop/IVsSQM.cs` file and re-adds it to the `src/VisualStudio/Core/Def/ServicesVisualStudio.csproj` project because there is a some VS code with IVT that currently depends on the interop type existing.

The code is a sequence of if-then-else tests using value.Equals(input).
Someday we might do better using divide-and-conquer.

For the most part, this change implements the same encoding
for tuples that we use for dynamic. This means that interface
implementations and generic constraints are not covered, but
base types and type parameters are.

This change also doesn't have full tests for "long" tuples (nested tuple
transformations) or tuple types that can only be constructed in
metadata.

Move last custom MicroBuild step to Roslyn repo

This moves the last custom MicroBuild step into the Roslyn repo.  This now gives us fully control over the binaries produced and their final locations in our source.  No need to coordinate changes to the official build with source changes / branches.

Fix some fast up to date check issues

Merge the typeswitch implementation into master

Merge master into features/typeswitch

Properly round trip enum values in the settings manager code.

Fixed test when run in cs-CZ culture

Implement lowering of a pattern switch (i.e. the decision tree).

Merge future-stabilization into master

# Conflicts:
#	build/Targets/VSL.Versions.targets
#	src/EditorFeatures/Core/Shared/Preview/PreviewSolutionCrawlerRegistrationService.cs

The Visual Studio project system doesn't handle projects that don't
produce outputs very well. This problem was made a bit worse in
Update 3, and so it's easiest to just produce temporary outputs
that aren't consumed anywhere. Since we remove the setting of
TargetPath, we can't accidentally consume anything from these projects
in the real build.

Merge deconstructions into master branch

Updating the netci.groovy script to use 'latest-or-auto-dev15'

Remove SQM depedency from the compiler

Moved a PROTOTYPE comment to issue #12431, and report an unimplemented
error message rather than crashing the compiler when switching on float, double,
or decimal.