Fixes

1. Spelling fix for changelog
2. Remove $FCTVenable to unbreak FCTV. Prior to the BC conversion, this was set to 1 at game start, with no way to ever set it to 0; it's now set to 0 at game start, with no way to ever set it to 1, so FCTV is basically broken for all new games. Not much point in having a variable that can't be changed anyway, so just get rid of it.
3. Fix a few corp variables that were accessed via State.variables instead of the V proxy to use the new variables in the V.corp object instead of trying to read the old loose ones.
4. Preserve $PAidTarget and $PRaidTarget through BC, since they are each used by two separate events which occur on different weeks.