Restyle spawn-phase self highlight: gold instead of white

The local player's spawn ring was plain white, which was hard to see
against white mountain terrain. Recolor it to a bright gold so it stays
visible regardless of the terrain underneath, and make it stand out more
overall during the spawn phase:
- Recolor the self ring from white to a bright gold tint
- Keep the ring center transparent so your territory shows through,
  ramping up to solid at the inner edge
- Raise the breathing opacity floor (35% -> 65%) so the ring stays more
  solid through the dim part of the pulse
- Speed up the breathing animation and enlarge the self ring radii

src/client/render/gl/render-settings.json

@@ -286,11 +286,11 @@
   "spawnOverlay": {
     "highlightRadius": 9,
     "highlightAlpha": 1.0,
-    "selfMinRad": 8,
-    "selfMaxRad": 24,
+    "selfMinRad": 10,
+    "selfMaxRad": 30,
     "mateMinRad": 5,
     "mateMaxRad": 14,
-    "animSpeed": 0.0035,
+    "animSpeed": 0.005,
     "gradientInnerEdge": 0.01,
     "gradientSolidEnd": 0.1
   },