public void clear() {
        preferences.clear();

        randomizeId();
        setMaxUndos(30);
        setResourcesRelative(false);
        
        jsonData.clear();
        atlasData.clear();
        saveFile = null;
        DialogSceneComposerModel.rootActor = null;
        
        if (Main.atlasData != null) atlasData.produceAtlas();
        if (rootTable != null) rootTable.populate();
        setChangesSaved(false);
        newProject = true;
    }
Checks every drawable path for existence. Errors are reported as a list
of DrawableDatas.
@return A list of all DrawableDatas that must have their paths resolved.
Returns an empty list if there are no errors.
core/src/com/ray3k/skincomposer/data/ProjectData.java