AthleteDirectory - Introduce Folder Structure Part 1

... introduce new "home" Folder "Structure Object" representing the previous flat-folder QDir
... adjust relevant "QDir home" - access/use points to use the sub-folder method of the new object and not the standard folder access any more

Note: the new structure is not yet active ! - everything is written to the main folder still

To Do:
... add upgrade procedure for existing folder content to merge to the new folders