Add Discord community version (64-bit only)

- Added realracing3-community.apk (71.57 MB)
- Removed 32-bit support (armeabi-v7a)
- Only includes arm64-v8a libraries
- Decompiled source code included
- Added README-community.md with analysis

decompiled-community/sources/com/mbridge/msdk/mbnative/a/b.java

@@ -0,0 +1,18 @@
+package com.mbridge.msdk.mbnative.a;
+
+import com.mbridge.msdk.out.Campaign;
+
+/* loaded from: classes4.dex */
+public abstract class b<K, V> {
+    public V a(K k, int i) {
+        return null;
+    }
+
+    public abstract void a(K k, V v);
+
+    public abstract void a(K k, V v, String str);
+
+    public abstract void a(String str, Campaign campaign, String str2);
+
+    public abstract V b(K k, int i);
+}