Better bullet traces and raycast for hitscan

scenes/weapon/misc/bullet_trail_generic.gd

@@ -0,0 +1,22 @@
+extends MeshInstance3D
+
+func init(pos1, pos2):
+	var draw_mesh := ImmediateMesh.new()
+	mesh = draw_mesh
+	draw_mesh.surface_begin(Mesh.PRIMITIVE_LINES, material_override)
+	draw_mesh.surface_add_vertex(pos1)
+	draw_mesh.surface_add_vertex(pos2)
+	draw_mesh.surface_end()
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	pass # Replace with function body.
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta: float) -> void:
+	pass
+
+
+func _on_timer_timeout() -> void:
+	queue_free()