Content update! New hero, skills, and more. — HellEscape Steam update #814169

- Added hero: 'Gunslinger'. - Added skills: 'Revolver', 'Dynamite', 'Cards'. - Made 'Entangle' slightly weaker. - Made the bombers challenge spawn more bombers. - Made 'Bladedancer' weapons slightly stronger. - Added creatures: 'Fallen' (in 'Ancient Ruins' stage), 'Horse' (mount for a new hero). - Made 'Frozen Ground' freezing effect longer and consistent. - Added apperance change effect to Blademaster if he learn 'Light Blade' to a level higher than 'Dark Blade'. Also added a tail in dark mode. - Upgraded build to .net 7.0. - Increased 'Fireball' and 'Bubbles' damage. - Made the 'Obelisk' and 'Travel East' missions slightly easier.