Updated with balance improvements, UI tweaks and bug fixes — Democracy 4 Steam update #1158986

1) Fixed bug relating to sound card drivers. Sound engine can now be overriden in prefs.ini 2) Fixed issue where driverless cars situation would not trigger correctly. 3) Party names can be edited simply by clicking the name instead of the up/down arrow now. (On customise mission screen). 4) Party names on customize mission screen sorted alphabetically, and scale to whole window if only 2 parties selected. 5) Fixed a bug where disabling the third party on countries that have it by default was being ignored. 6) Fixed crash bug when renaming a minister then clicking next turn. 7) Re-designed immigration system so factors feed into immigration demand, which then applies to illeghal or normal immigration depending on rules. 8) New gears icon shows and is clickable on a policy or other effect that has additional factors included in its calculations. 9) Rebalance of GDP at the high end, so tha...