Split VS2022 into a separate product.

Fix checkout on files open for merge/integrate

Remove default changelist param in p4 edit command

bump version number

Update versions to 2.6.4

Update azure-pipelines.yml

Update azure-pipelines.yml for Azure Pipelines

use windows-2019 vm so that the 2 build configs work. 
It expects to be built for VS2019

Update azure-pipelines.yml

Update version to 2.6.1

Add VisualStudioSDK in place of several packages

Remove unused files

Remove index.html and stylesheet.css as they are not used for anything.

Update to version 2.5

Revert back to 2017 Azure VM

Issues with missing assemblies in 2019, reverting back to 2017 for now.