Balances and small fixes + new enemy — HellEscape Steam update #814171

- Made suicide skeletons more pushy. - Made the Near Death mission slightly harder. - Added enemy: 'Skeleton Archer'. - Made 'Spirit Wolf' stronger. - Made 'Serpent' immune to negative effects, but also debuff for 3 seconds when he lands. - Made 'Ice Spear' freezing effect a lot longer. - 'Animal Domination' will now include damage done by the controlled animals + their own health in DPS calculations. - Improved 'Iron Skin' to add more max armor + absorb damage. - Made Serpent boss slightly stronger. - 'Rain of Arrows' special ability was FPS dependent. Fixed that + nerfed it a bit. - Made Spears stronger. - Made some desert enemies faster + added fireball to Djinns - Increased enemies max speed buffer. - Made 'Whip' slightly stronger. - Added win / lost ratio per hero to game stats (will only start counting from this update).