Update Game Settings

[nbintertech]

1. We need to implement the allow budget carryover setting. The default should be no, BUT if a user has negative budget, the negative should carryover.
2. Implement cost savings carryover - "Never", "1 Year" (current state), "Always"
   Always - cost savings for each year, should be applied to the budget for each subsequent year

[nbintertech]

'Never', '1 year' completed by 222 PR

Halting on this for now, got a heads up on possible changes coming down from Kristina/Paulomi. Rachel and I need to meet on what 'always' means

[koay9f]

Always means it acts like the "renewables" and you get the cost savings each year.
then your budget add on could just be calculated as (energyUse beginging - energyUse now) * energyCost, but then that might double count whatever you end up doing for renewables, so maybe I should just shut up...

[nbintertech]

This is done. Broke out the 'always' into #281