Updating the release pipeline to use the newer StoreBroker v2 tasks
for automated deployment to the Store.
Must rev the version of the internals package in order to get the
latest version of the PDP files and config file.
* Added new dev app icons
* Removed VS added page include in calculator.vcsxproj.filters and increased the internal version number and the app version number
* Move build jobs to the Hosted VS2017 pool instead of our internal pool
* Move the prepare-release-internalonly job from a team-specific pool to a shared pool with more capacity
* Remove symbol publishing from PR/CI builds since it's not necessary; do it only in release builds
