Add a cooldown to election rigging and demote on election.

[Zhong Xina]

Obviously it's not a problem when you have one hacker, but just now there were 4 hackers basing together and constantly rigging the elections. The server was without a mayor for a good 3-4 hours today as every single time the mayor was elected, he was instantly demoted because 1 of the 4 hackers rigged it. Add a 10-20 minute cooldown.