Give the rebuildable reward designs unique touches

Rewards whose look the basic designs can build now carry a touch the builder
cannot make: bursts on jumping, landing or sneaking, footprints, a line to
nearby players with the same reward, a December extra, aimed enchanting
glyphs, a heartbeat, a jump-beat wing or an orbiting shape. BodyMotion tracks
the jump, land and sneak events the touches react to.

LobbySystem/src/de/steamwar/lobby/particle/design/FixedDesign.java

@@ -32,6 +32,8 @@ public class FixedDesign extends ParticleDesign {
     private final int points;
     private final Consumer<ParameterValues> defaults;
     private final Supplier<ParticleElement> shape;
+    private Supplier<ParticleElement> touch;
+    private int touchPoints;
 
     public FixedDesign(String id, Material icon, String nameKey, ParticleRequirement requirement, int points, Consumer<ParameterValues> defaults, Supplier<ParticleElement> shape) {
         super(id, icon, nameKey, DesignVisibility.REWARD, requirement);
@@ -45,9 +47,21 @@ public class FixedDesign extends ParticleDesign {
         return shape.get();
     }
 
+    // Adds the reward's unique touch; its points count towards the slot budget
+    public FixedDesign withTouch(int touchPoints, Supplier<ParticleElement> touch) {
+        this.touchPoints = touchPoints;
+        this.touch = touch;
+        return this;
+    }
+
+    @Override
+    public ParticleElement touch() {
+        return touch == null ? null : touch.get();
+    }
+
     @Override
     public int points(ParameterValues values) {
-        return points;
+        return points + touchPoints;
     }
 
     @Override