v0.0.8a - Map editor update

New in this update (v0.0.8a) :

• Level editor (!)
  •  Early access - maps may not be compatible with future versions (but I will do my best to ensure that it remains compatible)
    
• Import / export maps, web version (this one) and desktop version compatible
• You can download custom_map.json and import ingame to play the map, or create your own and share it
  

• Level selection screen (need more work but it's not the priority)
  • 1 new map available
• Some bug fixes and QOL (auto capture, etc.)

Next update will be (mainly) focus on :

• Victory condition rework
  
• Balancing damage calculation and AI
• More AI behavior
  
• More QOL
• Maybe a better UI (with unit selected, etc.)
• Code optimisation