clean up sample to just basics for now, start stubbing in lib

src/discord-rpc.cpp

@@ -0,0 +1,23 @@
+
+
+static DiscordEventHandlers Handlers;
+
+void Discord_Initialize(const char* applicationId, DiscordEventHandlers* handlers)
+{
+    if (handlers) {
+        memcpy(&Handlers, handlers, sizeof(Handlers));
+    }
+    else {
+        memset(&Handlers, 0, sizeof(Handlers));
+    }
+}
+
+void Discord_Shutdown()
+{
+
+}
+
+void Discord_UpdatePresence(const DiscordRichPresence* presence)
+{
+
+}