Fixes: Belgium, advertising boards, young players — Whistle1 - Retro Football Manager Steam update #6636857

Corrections and fine-tuning. - There are real sponsors on the advertising boards instead of made-up names, which can be changed in the editor. - Sponsor levels 7 and 8 are accessible in the editor for the first time. - Young top performers cost more, young supplementary players cost less. - Club logos are displayed larger everywhere, including in press conferences. - Uploaded logos with a transparent border will be cropped. - An active database no longer affects other save games. - The list of your own files opens without waiting. - The online list shows clubs, players, dates and descriptions. - When uploading, a waiting notice finally appears. - League names from the editor apply again in all built-in countries. - Rolling with your finger now also works over buttons. - The calendar correctly calculates leagues with an odd number of clubs. - Belgium plays its real format: 18 clubs, no pl...