Minor update 0.7.61

Nations:
- Gluttony
-- The appearance of the capital on the world map has been improved;
-- Mummy, Guzzler and Meatball received the "Cheap Healing" skill;
-- Envy
-- Larva and Bombardier received the "Cheap Healing" skill;
- Everybody;
-- Improved loading of battlefield graphics when attacking their capitals;

Human Player Switching Screen:
- Fixed:
-- The action and position of the player ready button;
-- Player resources are no longer shown;
-- Repainting the top and bottom lines;

Other:
- Fixed:
-- Positioning:
--- building icons in the city panorama;
--- sidebar spell icons when casting;
--- cast spell on the world map;
- Painting and graphics of fog of war;
- An empty skill "Cheap Treatment" has been added to inform that the cost of healing a character is very low than usual.