Scale gravity pull of projectiles with ammo weight

[ProbablyManuel]

Requiem greatly increases gravity pull of ammo, which is deemed irritating and unrealistic by many players. It was recently suggested to alleviate this issue by tying the gravity pull to the weight of the ammo.

This is a follow-up of #217

Expected Outcome

• The gravity pull of projectiles is determined by ammo weight:
  • None: 0.0
  • Light: 0.2
  • Medium: 0.35
  • Heavy: 0.5
  • Massive: 0.65