Export path may now be written as a relative path

If the target directory does not exist, it will be recursively created.

Export paths are now saved as a relative to the projects base directory

Renamed relative_to function to final_path_from_relative which takes a relative path and outputs the final path from a string that represents a directory.
Added relative_path_from_final which takes in a final path and outputs a relative path if possible. If not possible it outputs the relative path that represents the current directory.
If the target directory does not exist when exporting the project, then it is recursively created.

Removed final_path_from_relative function

Changed DirAccess into DirAccessRef for automatic object destruction

editor/editor_properties.cpp

@@ -208,7 +208,13 @@ EditorPropertyTextEnum::EditorPropertyTextEnum() {
 
 void EditorPropertyPath::_path_selected(const String &p_path) {
 
-	emit_changed(get_edited_property(), p_path);
+	String final_path = p_path;
+	if (final_path.is_abs_path()) {
+		String res_path = OS::get_singleton()->get_resource_dir() + "/";
+		final_path = res_path.path_to_file(final_path);
+	}
+
+	emit_changed(get_edited_property(), final_path);
 	update_property();
 }
 void EditorPropertyPath::_path_pressed() {
@@ -221,6 +227,13 @@ void EditorPropertyPath::_path_pressed() {
 	}
 
 	String full_path = get_edited_object()->get(get_edited_property());
+	if (full_path.is_rel_path()) {
+
+		if (!DirAccess::exists(full_path.get_base_dir())) {
+			DirAccessRef da(DirAccess::create(DirAccess::ACCESS_FILESYSTEM));
+			da->make_dir_recursive(full_path.get_base_dir());
+		}
+	}
 
 	dialog->clear_filters();
 

editor/project_export.cpp

@@ -931,8 +931,17 @@ void ProjectExportDialog::_export_project() {
 		export_project->add_filter("*." + extension_list[i] + " ; " + platform->get_name() + " Export");
 	}
 
-	if (current->get_export_path() != "") {
-		export_project->set_current_path(current->get_export_path());
+	String current_preset_export_path = current->get_export_path();
+
+	if (current_preset_export_path != "") {
+
+		if (!DirAccess::exists(current_preset_export_path.get_base_dir())) {
+
+			DirAccessRef da(DirAccess::create(DirAccess::ACCESS_FILESYSTEM));
+			da->make_dir_recursive(current_preset_export_path.get_base_dir());
+		}
+
+		export_project->set_current_path(current_preset_export_path);
 	} else {
 		if (extension_list.size() >= 1) {
 			export_project->set_current_file(default_filename + "." + extension_list[0]);