Added Japan! Plus some crash bug fixes, performance improvements and balancing — Democracy 4 Steam update #1158985

1) Agreeing to the Freedom Of Information Dilemma now reduces Corruption. 2) Resignation dialog now shows effect on voter perceptions of leader. 3) State Broadcaster now takes a year to implement, and reduces impact of Media Monopoly situation. 4) UK now has the English language correctly affect Immigration demand, not actual Immigration. 5) Some UI improvements to the 'update mod' and 'create mod' screens. 6) Cancelling driverless car laws after the situation triggers will now end that situation. 7) Increased worst case main-screen performance on old integrated intel chips from 30fps to 71fps! 8) Fixed bug where global interest rates showed up as a debt crisis input and would crash if clicked. 9) Japan added! 10) Added earthquake and tsunami events 11) Added back-button to the customise mission screen. 12) Fixed crash when starting a game, then a 2nd game and hitting the electioneering ...