Make more deletion code non-VB specific.

Remove VB specialization.

Fixing the VsixVersion to be 42.42.42.42 for unofficial builds.

Ignore VS Code-generated dirs in gitignore

Bump package versions to beta4

Added initial support for explicit tuple conversions

Ensure experimental settings run against experimental features

Revert change to IIncrementalAnalyzer interface

Repurpose 'Info' to mean 'Suggestion'.

loose up a bit on what happens when build error report on us errors o…

This reverts commit 1b6a83f9.

This reverts commit 7357c7ba.

loose up a bit on what happens when build error report on us errors on a file that doesn't exist in roslyn solution
but have error code we own.

we used to treat them as project level errors but that made us to sometime show one entry for multiple error reports.

now, we will at least show all of them, but things like double click will not work since we don't know which document it is.

While working on another change I noticed that our testing support for experimental features didn't actually verify the underlying feature was experimental.  Hence helpers like ParseExperimental(...) would continue to function without error when tuples / ref returns were attached to the /langver switch.  This creates maintenance issues in our test framework as it's unclear what we're actually testing.

I refactored the code involved to verify the features are actually experimental and removed some troublesome helpers.

found one more case where documentId can be null

Removing the warning supressions for CS7035 and BC42366

Add namespace-name suggestions to C# and VB

Persist the low-memory-mode option to the registry

Improve implementation of analyzer loader

The old settings caused the project to be run but,
as a VSIX project, it could not be run. Instead, this
changes the project to start a new copy of devenv with
the VSIX in a new hive.