Revert "remove DXBuildGenerator submodule u can use the build tool from DX"

This reverts commit 49813ae2cecb7477972db6953693e44fe8f9cc42.
https://github.com/apobekiaris/eXpand/commit/49813ae2cecb7477972db6953693e44fe8f9cc42#commitcomment-7367468
fix FeatureCenter EasyTests
minor update
[New XpandAutoTest EasyTest command]