Changes:
* Building purchase costs when speed buying is now based on the level of the building. Level 1 is unchanged but for every level after that it will increase the multiplier by one
* Income from Tourism and Trade traffic at very high levels has been slightly reduced

Fixes:
* Fixed Starbases launching a large amount of fighters which was causing turns to slow down due to the very high number of ships in late games
* Fixed an issue where fighters would not land immediately upon being recalled to their carrier
* Fixed an issue where sharing intelligence (treaty) could cause a crash
* Colonizing a previously occupied colony will have previously selected builds/upgrades cleared until the player chooses to build/upgrade (existing buildings are left intact)