LogicBattle::isEndConditionMatched, transcribed: the battle is over when
end_counter is positive, when either king is dead, when tick/20 seconds
reach MatchLength + OvertimeSeconds, or - once past MatchLength - when
the crowns differ. the divisor is the 0x66666667/2^35 multiply in the
client, which is a divide by twenty, so the battle runs at 20 ticks a
second.
crowns come from LogicSummoner::getStars: three when the enemy king is
down, otherwise two minus the enemy princess towers still standing,
which is exactly what leader_towers holds.
BattleRegistry keeps the LogicGameMode we built for each account and
advances it on the tick the client reports in its turn message, so the
server now tracks the clock, the crowns and whether the battle is over,
and drops the session when the player goes home. the two isSummoner
guards in the overtime branch are left out: they only fire for an object
that is not a summoner, which a king tower always is.
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