Single-use items now work

Fixes and additions:

• Single-use items now work properly: potions, energy drinks, fire bombs
• The sidearm will display number of bullets
• Guard recovers some HP and MP
• Some texts were changed (typos mostly)
• Some conversations were added
• Winning the "fateful fight" is now properly supported 
• The Cobalt Orion now has a proper signature move. 
• Some rebalancing 

Roadmap:

• Add optional boss
• Guard Skill, although functional, looks a little jank... would like to fix that.