Version 1.0.24 - Investor nerf, significant buffs to underused perks

Balance: * Investor nerfed to 2%. Also now caps at +$20. * Active Builder buffed back to 10%. (Text also clarified.) * Brute Force and similar upgrades now reduce the cost of their related Tech Labs by 50%. * Oil Baron now reduces the cost of Refineries by 50%. * Tea Traders buffed back to +$3 per empty slot * RepairBarge now fully heals your ships, rather than partially between missions * Tweaked how Patrols/Interceptors calculate kills. They should be more reliable now.

Minor: * Plane speed should generally be increased. * Spy Network is now more explicit * Oil Baron now modifies the the Refinery's description * Cities now highlight their pop in orange in the City Management panel if they require housing to utilize all of their growth. * Friendly cities now highlight their growth in Orange or Red if they require housing (on the battlemap) * Removed new debug lines that were causing the log to become potentially hundreds of megabytes long * AI will no longer get stuck with things in queue that are no longer relevant (e.g. a SuperCarrier while at 10 population) * Mission Summary expanded a bit to handle more complex descriptions * Fixed more text errors regarding Move Actions on Ports. * Fixed a bug where owning a Gun Fort would cause the End Phase button not to highlight * Fixed a bug where Challenge mode was being 'remembered' for Hard+Brutal and then ignored, rather than being remembered for lesser difficulties