ECS, our own Renderer and much better gameplay

You can download the game here:
https://gamejolt.com/games/somepolishcoders/440031
https://somepolishcoders.itch.io/pophead

Major changes:

• code:
  Change game objects architecture from inheritance based to ECS
  Create our own modern OpenGL Renderer
• gameplay:
  Fix graphical artifact "tile bleeding"
  Add pixel art texture filtering
  Add lighting
  Make better damage juice
  Add new type of weapon (Shotgun)
  Add ammo boxes, Make zombie not drop ammo
  Increase pace of the game
  Make sewage map and arcade sewage map a lot better
  Balance arcade mode by ammo boxes and new weapon
  Improve gameplay tutorial