Update 0.624

What's new: 1) Added tutorial tips for the market, enterprises, and companies. 2) Fixed a bug that caused unjustified relations improvements. 3) Improved productivity. As part of this, supplying armies via convoys has been disabled for now. 4) Fixed a bug that prevented national competencies from increasing due to the work of enterprises. 5) The key rate can no longer be set below zero. 6) Added the effect of a region's standard of living on its production capacity. 7) Changed the prices of some goods. 8) Added the option to pay off the entire national debt at once.