Working template (RmlUi 6.2)

Needs:
- Lua plugin
- SVG plugin

vendor/rmlui_backend/RmlUi_Include_Windows.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#ifndef RMLUI_DISABLE_INCLUDE_WINDOWS
+
+	#if !defined _WIN32_WINNT || _WIN32_WINNT < 0x0601
+		#undef _WIN32_WINNT
+		// Target Windows 7
+		#define _WIN32_WINNT 0x0601
+	#endif
+
+	#define UNICODE
+	#define _UNICODE
+	#define WIN32_LEAN_AND_MEAN
+	#ifndef NOMINMAX
+		#define NOMINMAX
+	#endif
+
+	#include <windows.h>
+
+#endif