survivors: reducing jumpiness of homing projectiles re-directing by limiting it to a certain angle

adding rad degree conversion utils checking world border for projectiles

absurd-survivors/src/utils.ts

@@ -15,4 +15,12 @@ export function moveInDirectionOf(position: Vector, target: Vector, speedFactor:
 
 export function straightMove(position: Vector, speed: Vector): Vector {
     return position.add(speed)
+}
+
+export function toRad(angle) {
+    return angle / 180 * Math.PI;
+}
+
+export function toDegrees(angle) {
+    return angle * 180 / Math.PI
 }