v0.2.2

• Add functionality to adjust Crawler NPC HP from the Crawler sheet
• Add clamp helper method
• Use arrow functions for helpers
• Update permitted Actor types per Item type in template.json
• Update code to restrict addition of items to actors
• Limit Chassis to one per Actor
• Add chassis to NPC Mech sheet
• Allow NPC Pilots to hold Equipment items
• Add danger style to HP and SP rows when the value reaches 0