DS-452 Adds helper variables for Shipment Form
DS-452 Adds dosomething_shipment_form into Campaign
DS-452 Display old people copy
DS-452 Display form submitted copy if shipment exists
DS-452 Fixes undefined index errors in custom settings form
UK SSO: Improve module installation.

- Preset `dosomething_user` variables on install
- Remove `dosomething_user` variables on uninstall
Merge pull request #3129 from sergii-tkachenko/DS-381_uk-improve-module-installation

UK SSO: Improve module installation.
Changes per #3128 review
Merge pull request #3128 from aaronschachter/shipment_form

Campaign Shipment Form