Added difficulty modifier for clearing sectors upon loss

core/assets/bundles/bundle.properties

@@ -1450,6 +1450,8 @@ rules.buildaitier = Builder AI Tier
 rules.rtsai = RTS AI
 rules.rtsai.campaign = RTS Attack AI
 rules.rtsai.campaign.info = In attack maps, makes units group up and attack player bases in a more intelligent manner.
+rules.clearsectoronloss = Clear Sector On Loss
+rules.clearsectoronloss.info = When the sector is lost, player buildings from the previous attempt will not carry over.
 rules.rtsminsquadsize = Min Squad Size
 rules.rtsmaxsquadsize = Max Squad Size
 rules.rtsminattackweight = Min Attack Weight