RuleUfo is const where we can.

Every file except loading the rules uses const RuleUfo.
RuleRegion is const where we can.

Every file except rule loading uses const RuleRegion.
RuleSoldier is const where we can.

Every file except rule loading uses const RuleSoldier.
RuleAlien is const where we can.

Every file except rule loading uses const RuleAlien.
AlienDeployment is const where we can.

Every file except rule loading uses const AlienDeployment.
RuleCountry is const where we can.

Every file except rule loading uses const RuleCountry.
RuleBaseFacility is const where we can.

Every file except rule loading uses const RuleBaseFacility.
Armor is const where we can.

Every file except rule loading uses const Armor.
RuleResearch is const where we can.

Every file except rule loading uses const RuleResearch.