Implement city report options

[axx0]

• [ ] Warn when city growth halted (Aqueduct/Sewer System)
• [ ] Show city improvements built
• [ ] Show non-combat units built
• [ ] Show invalid build instructions
• [ ] Announce cities in disorder
• [ ] Announce order restored in city
• [ ] Announce "We Love The King Day"
• [ ] Warn when food dangerously low
• [ ] Warn when new pollution occurs
• [ ] Warn when changing production will cost shields
• [ ] "Zoom-to-City" NOT default action