After build tasks to verify downloaded tools and generated .props file

[dsgouda]

As of today, we do not have a reliable way to log/inform if the build steps
msbuild build.proj /t:build
downloaded all the proper tools required
AND
msbuild build.proj /t:build /p:Scope=SDKs\<RP>
generated/added the proper metadata in the .props file for given RP

There should be some <BeforeTargets> tasks added that perform this validation (existence of required files in tools dir and metadata in the .props file)

[dsgouda]

Feature is Merged.