Fix weapon position, scale, switch to GLB imports

- Reduced weapon scale 10-13x (previously OBJ models at native size)
- Adjusted on-screen position for each weapon type
- Switched from OBJ to GLB imports (better pivot points)
- Fixed Revolver model coordinate issue

assets/quaternius/weapons/p90.tres

@@ -7,9 +7,10 @@
 [resource]
 script = ExtResource("1")
 model = ExtResource("2")
+position = Vector3(0.35, -0.35, -0.4)
 crosshair = ExtResource("3")
 rotation = Vector3(0, 180, 0)
-muzzle_position = Vector3(0.1, -0.4, 1.5)
+muzzle_position = Vector3(0.05, -0.3, 0.8)
 cooldown = 0.08
 max_distance = 15
 damage = 18