Rollback API change to unbreak TypeScript.

The list of insertion files was missing System.Xml.ReaderWriter.dll, which breaks the toolset package and also results in an incomplete VS insertion.

Fix builds on Dev15 only

Improve diagnostics experience for public signing.

Moving the LibGit2Sharp.NativeBinaries reference back to 1.0.129

Removing the LibGit2Sharp.NativeBinaries reference so that it is picked up from the LibGit2Sharp dependencies

Fixes a number of small issues around building and running tests on a
Dev15 only machine.

Trigger C# suggestion mode except for snippets

Properly compare prefix length

Don't use symbolid in symbol completion

Don't show builder after dot

Add fact attributes/fix a test

Don't apply the "objectcreation" completion tag

when triggering completion on backspace.

Use editorbrowsable options when computing cref descriptions
Share cref description computation code between C#/VB
Etc

Fix issue with 'Convert Prop to Method' with member bindings.
Fixes #16157

Fix crash in outlining when indexing out of an incomplete multiline comment.
Fixes #16186

Add guids back into the FAR results so that 'filtering' works properly.
Fixes #15830

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

Revert "move StreamJsonRpc to latest version"