move StreamJsonRpc to latest version

There were two root causes here:

    1) The rewriter was treating the difference between the symbol and
       `symbol.ConstructedFrom` as whether or not there were any type
       parameters remaining that may need substitution. This is invalid
       for recursive local functions.

    2) The local function reference rewriter was including type
       parameters from the containing type in the list of parameters to
       substitute. This should happen iff the containing type is a
       lambda frame used to capture variables, which is not always the
       case for local functions (although it is always the case for
       lambdas).

Fixes #15751

Add per language options to disable GoToDef and GoToImpl.

Fixes #15958

add sort_system_directives_first option to editorconfig

Parse incomplete code differently to better reflect user intent.

Fixes #15881

Export the SuggestedActionsSourceProvider for specific langauges.

InvalidOperationException emitting reference to void* parameter with custom modifiers

Infrastructure fixes

It's used in the logging scenarios.

This change will cause our bootstrap build to fail if a threshold of server connection failures
occur.  The threshold is chosen a bit arbitrarily as valid failures can occur.  But 15 seems like
a number to warrant an investigation.  If this produces too many false positives it will be
adjusted appropriately.

The bootstrap configuration files were added when we had static config files checked into the repo.  Now that the config files are auto-generated with correct binding redirects (based off of the current build version) these are unneccesary.

Local functions have already implemented their own frame management,
including frame pointer "capturing" (which is implemented by passing a
list of frames to the local function by-ref, rather than traditional
lambda capturing which is implemented by keeping a linked list of frame
pointers to parent frames).

PR #14736 wired up local function lowering to the lambda frame pointer
machinery, which is necessary for when a local function is captured by a
lambda or converted to a delegate, but in the process it diverted
control flow for pure local function capturing to the frame pointer
machinery, which can't handle the structure of local function struct
frame pointers.

This PR resolves the issue by restoring the control flow for local
functions capturing other local functions with by-ref struct frames.

Fixes #15599

Scripting on .NET Core 1.1

fixed 2 bugs reported on primary workspace

Push task queue to CPSProject

Updating the test projects to specifiy `shadowCopy=false` and to reference the VS test adapter package.

Update versions in post-dev15 branch to 2.1.0-beta1