Ultimate GM Basketball Manager

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- Added an option to overwrite save files.
- Optimized startup speed and loading of data.
- Added a manual save button. Automatic save is now removed.
- Fixed a visual bug where a players box scores where not correctly displayed.
- Trade offers will now be removed when backing out of them.
- Added a notification system, which gives feedback to the user after various actions. (Saving, trade completed, etc.)