MQ: East build and test setup

a.	Wire up VS development environment to get access to msbuild.exe, mstest.exe, etc.
b.	Detect command should get launched elevated.
c.	Setup up artifacts such as  Emulators, Django, etc which are used by tests
d.	Updated build.proj to delete test result file before launch the mstest.exe, as it is sort of annoying that the test run fails for error like “…..trx is existing already”
e.    Also it appears common test project misses a nuget package reference which introduces build flakeness for “reference not found” in a clean dev box. I fixed that as well.