release_3200

All PRs included

#2467 Content changes for opposite and same sex outcomes where user lives in UK or SA
#2479 Introduce concept of Period of Incapacity for Work into calculate-statutory-sick-pay
#2483 Remove space-stripping ERB tags from state-pension-through-partner
#2487 Avoid raising InvalidResponse exception in calculators
#2456 National minimum living wage update
#2488 Remove unused outcomes attr_reader from Flow class
#2489 Rename files for PartYearProfitTaxCreditsCalculator tests

PRs to check post-deployment

#2467 Content changes for opposite and same sex outcomes where user lives in UK or SA
#2456 National minimum living wage update