Move dead submodules in-tree

Signed-off-by: swurl <swurl@swurl.xyz>

externals/discord-rpc/src/connection.h

@@ -0,0 +1,19 @@
+#pragma once
+
+// This is to wrap the platform specific kinds of connect/read/write.
+
+#include <stdint.h>
+#include <stdlib.h>
+
+// not really connectiony, but need per-platform
+int GetProcessId();
+
+struct BaseConnection {
+    static BaseConnection* Create();
+    static void Destroy(BaseConnection*&);
+    bool isOpen{false};
+    bool Open();
+    bool Close();
+    bool Write(const void* data, size_t length);
+    bool Read(void* data, size_t length);
+};