HMCLauncher: try bundled JRE

HMCLauncher/HMCL/java.h

@@ -0,0 +1,10 @@
+#pragma once
+#include <windows.h>
+#include <string>
+#include "Version.h"
+
+// Find Java installation in system registry
+bool FindJavaInRegistry(std::wstring &path);
+
+// Find Java Installation in registry and environment variable
+bool FindJava(std::wstring &path);