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GDP++: Factories and Labs

Allows placement of multiple localized research centers, boosting science in nearby cities. Also increases gains from production- and science-boosting research.

Intended for a faster-paced conquest mode experience where enemy GDP can be reduced through conventional means.

Features:
- Research Labs
- Up to 25 science-boosting Research Centers can be placed.
- Each has a 200 km radius, boosting science by 2x of cities within this area.
- Unlocked by Defence Research Agency, just like in the stock game.

- Factories
- Up to 25 industry-boosting Factories can be placed.
- Each has a 100 km radius, boosting industry by 2x of cities within this area.
- Unlocked by Improved Machine Tools.

- The area of boost-effect can be viewed by clicking on the building and enabling its attack radius visibility.
- Adjusts the stock AI to use these new buildings properly.
- The rewards from science- and production-boosting research has been adjusted (see below).

Stock Techs
Base -> Lvl1 -> Lvl2 -> Lvl3 -> Lvl4
100% -> 105% -> 115.5% -> 127% -> 139.8% -> 153.7% (Stock)

Buffed Production Techs
100% -> 125% -> 130% -> 195% -> 275% -> 300% (This Mod)

Buffed Research Techs
100% -> 125% -> 156% -> 234% -> 295% -> 345% (This Mod)

Planned:
- Additional balancing.
- Possible mutual exclusivity (city is either research-boosted or industry-boosted).
- Additional AI tweaking to improve use.
- May spin the tech % boosts into a separate mod for those who just want the placeable buildings.
- Custom Factory model.

Probably not planned:
- Espionage... centers? I think the central espionage center is fine as it is currently. I may be convinced otherwise. :)