Add colour along the wing and sparkle to lobby wings

Both wing designs can colour their points from the spine to the tips
instead of changing colour over time, and a sparkle setting shows only a
share of the points each tick, which also lowers their cost. The angel
and phoenix drawn shapes are removed.

LobbySystem/src/de/steamwar/lobby/particle/ParticleTickData.java

@@ -43,6 +43,8 @@ public class ParticleTickData {
     private boolean onlyOthers = false;
     // Set for entries placed relative to the body, null for world placement
     private BodyFrame frame;
+    // Where a point sits along its shape, from 0 to 1; when set, gradients colour by it instead of by time
+    private Double shade;
 
     public ParticleTickData withLocation(Location location) {
         ParticleTickData particleTickData = copy();
@@ -57,6 +59,17 @@ public class ParticleTickData {
         return particleTickData;
     }
 
+    public ParticleTickData withShade(double shade) {
+        ParticleTickData particleTickData = copy();
+        particleTickData.shade = shade;
+        return particleTickData;
+    }
+
+    // The gradient position for this tick: along the shape when a shade is set, otherwise moving with time
+    public double gradientPosition() {
+        return shade != null ? Math.min(shade, 0.9999) * 360 : (deg * 10) % 360;
+    }
+
     public ParticleTickData onlySelf() {
         ParticleTickData particleTickData = copy();
         particleTickData.onlySelf = true;
@@ -77,6 +90,6 @@ public class ParticleTickData {
     }
 
     public ParticleTickData copy() {
-        return new ParticleTickData(world, player, location, deg, isMoving, viewers, onlySelf, onlyOthers, frame);
+        return new ParticleTickData(world, player, location, deg, isMoving, viewers, onlySelf, onlyOthers, frame, shade);
     }
 }