Added splash image support and new progress bar for web export

platform/web/export/export_plugin.cpp

@@ -170,6 +170,7 @@ void EditorExportPlatformWeb::_fix_html(Vector<uint8_t> &p_html, const Ref<Edito
 	replaces["$GODOT_PROJECT_NAME"] = GLOBAL_GET("application/config/name");
 	replaces["$GODOT_HEAD_INCLUDE"] = head_include + custom_head_include;
 	replaces["$GODOT_CONFIG"] = str_config;
+	replaces["$GODOT_SPLASH"] = p_name + ".png";
 
 	if (p_preset->get("variant/thread_support")) {
 		replaces["$GODOT_THREADS_ENABLED"] = "true";