Make io thread optional

include/discord-rpc.h

@@ -1,6 +1,8 @@
 #pragma once
 #include <stdint.h>
 
+//#define DISCORD_DISABLE_IO_THREAD
+
 #ifdef  __cplusplus
 extern "C" {
 #endif
@@ -36,7 +38,12 @@ void Discord_Shutdown();
 void Discord_UpdatePresence(const DiscordRichPresence* presence);
 
 /* checks for incoming messages, dispatches callbacks */
-void Discord_Update();
+void Discord_RunCallbacks();
+
+/* If you disable the lib starting its own io thread, you'll need to call this from your own */
+#ifdef DISCORD_DISABLE_IO_THREAD
+void Discord_UpdateConnection();
+#endif
 
 #ifdef  __cplusplus
 } /* extern "C" */