Mayor system update!

Religion HP’s can now appoint Mayors of the towns they own. The mayor must
own/co-own a house in the city and must not be in a religion.

Mayors can
(currently):
Set the taxrate – between 0 and 10%, limited to 1 use a month.
The max tax a house can be required to pay is still 100.000 as
always.
Hire/Fire vendors and guildmasters – done on the stone (under “see guildmasters/vendors”), NPCs are fired by telling them to their face.

Important: vendors/guildmasters expect to get paid
once a month now, and will resign if they aren’t paid. Mayors, balance that
budget!

Guards aren’t included for now (as it screws with the siege
system).