Added Foreign keys for all entity tables and their related tables also #392

Fixes #76 (closed) - change Seperator to Separator ref #193 (closed)

Status changed to merged

@satish.dvnk @vtigerosm Is there any reason to downgrade this library from V5.19 to v4.19 while updated version is now v5.20.9 ?

Thanks @manuelgit, Sorry for wrong info, I will update version to v5.20.9 and will submit merge request