Extract EditorResourceConversionPlugin into its own source files and clean up editor includes

platform/javascript/export/export_plugin.cpp

@@ -31,6 +31,7 @@
 #include "export_plugin.h"
 
 #include "core/config/project_settings.h"
+#include "editor/editor_settings.h"
 
 Error EditorExportPlatformJavaScript::_extract_template(const String &p_template, const String &p_dir, const String &p_name, bool pwa) {
 	Ref<FileAccess> io_fa;