Adds spinning animation for meteors.

code/_helpers/matrices.dm

@@ -0,0 +1,17 @@
+/matrix/proc/TurnTo(old_angle, new_angle)
+	. = new_angle - old_angle
+	Turn(.) //BYOND handles cases such as -270, 360, 540 etc. DOES NOT HANDLE 180 TURNS WELL, THEY TWEEN AND LOOK LIKE SHIT
+
+
+/atom/proc/SpinAnimation(speed = 10, loops = -1)
+	var/matrix/m120 = matrix(transform)
+	m120.Turn(120)
+	var/matrix/m240 = matrix(transform)
+	m240.Turn(240)
+	var/matrix/m360 = matrix(transform)
+	speed /= 3      //Gives us 3 equal time segments for our three turns.
+	                //Why not one turn? Because byond will see that the start and finish are the same place and do nothing
+	                //Why not two turns? Because byond will do a flip instead of a turn
+	animate(src, transform = m120, time = speed, loops)
+	animate(transform = m240, time = speed)
+	animate(transform = m360, time = speed)