most of JHostIO / m_Do_hostIO done (#2288)

src/JSystem/JHostIO/JORMessageBox.cpp

@@ -0,0 +1,14 @@
+#include "JSystem/JHostIO/JORServer.h"
+
+u32 JORMessageBox(const char* message, const char* title, u32 style) {
+    u32 status = 0;
+    JORMContext* mctx = JORServer::getInstance()->attachMCTX(MCTX_MSG_OPEN_MESSAGE_BOX);
+    mctx->openMessageBox(&status, style, message, title);
+    JORServer::getInstance()->releaseMCTX(mctx);
+
+    while (status == 0) {
+        JOR_MESSAGELOOP();
+    }
+
+    return status;
+}