Balancing changes

Adjustments have been made to the research item availability timeline to facilitate better game progression. We've cut down the time between research levels, allowing more items to be available closer together or even overlapping. The following changes have been made:

• Harpy
  • reduced air harpy health to match the ground harpy health
• Research
  • deleted all lvl 8 and 9 research
  • reduced the gap between research levels
• Production times
  • reduced late-level production times slightly according to their new day of availability
  • adjusted min production times according to the new max level

Bug fixes

• An issue was fixed where the settings drop-down menu would not close upon a repeated click. The menu will now correctly close when clicked again.
• A bug was fixed where converting units outside of a province would cause exceptions. The "Convert" button will now be hidden once a move command is issued to a convertible unit and conversion is disallowed if the unit is not within a permissible conversion area.