Add static Vulkan loader.

Initial Vulkan support for Windows.
Initial Vulkan support for macOS.

editor/editor_node.cpp

@@ -5350,6 +5350,8 @@ void EditorNode::_update_video_driver_color() {
 		video_driver->add_color_override("font_color", Color::hex(0x5586a4ff));
 	} else if (video_driver->get_text() == "GLES3") {
 		video_driver->add_color_override("font_color", Color::hex(0xa5557dff));
+	} else if (video_driver->get_text() == "Vulkan") {
+		video_driver->add_color_override("font_color", Color::hex(0xad1128ff));
 	}
 }