Create a Progression Tracking System

[KarylReyne]

• ~system for loading mails/dialogues into the game (markdown parser?)~ mails will use the provided scriptable object, dialogue idk...
• [x] trigger script:
  • [x] OnTriggerEnter
  • [x] lambda or delegate?
• [x] send_mail function
• ~start_dialogue function~
• [x] add test trigger object to scene
• [x] fill demo level prog. script
• [x] tracker no monobehav.