feat: implement PlatinumTiming

* Also fix icons in InfiniteGP.

PlatinumTiming/MU3.Battle/patch_Counters.cs

@@ -0,0 +1,19 @@
+using MU3.Notes;
+
+namespace MU3.Battle;
+class patch_Counters: Counters {
+    public int PlatinumFastCount { get; private set; }
+    public int PlatinumLateCount { get; private set; }
+    public extern void orig_addPlatinumScore(Judge judge, Timing timing);
+    public new void addPlatinumScore(Judge judge, Timing timing) {
+        orig_addPlatinumScore(judge, timing);
+
+        if(judge == Judge.Perfect) {
+            if(timing == Timing.Fast) {
+                PlatinumFastCount += 1;
+            } else if(timing == Timing.Late) {
+                PlatinumLateCount += 1;
+            }
+        }
+    }
+}